author  huffman 
Thu, 31 May 2007 23:02:16 +0200  
changeset 23177  3004310c95b1 
parent 23069  cdfff0241c12 
child 23242  e1526d5fa80d 
permissions  rwrr 
15944  1 
(* ID : $Id$ 
12224  2 
Author : Jacques D. Fleuriot 
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Copyright : 2001 University of Edinburgh 

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Conversion to Isar and new proofs by Lawrence C Paulson, 2004 
12224  5 
*) 
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15944  7 
header{*MacLaurin Series*} 
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15131  9 
theory MacLaurin 
22983  10 
imports Transcendental 
15131  11 
begin 
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subsection{*Maclaurin's Theorem with Lagrange Form of Remainder*} 
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text{*This is a very long, messy proof even now that it's been broken down 
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into lemmas.*} 
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lemma Maclaurin_lemma: 
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"0 < h ==> 
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\<exists>B. f h = (\<Sum>m=0..<n. (j m / real (fact m)) * (h^m)) + 
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(B * ((h^n) / real(fact n)))" 
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apply (rule_tac x = "(f h  (\<Sum>m=0..<n. (j m / real (fact m)) * h^m)) * 
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real(fact n) / (h^n)" 
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in exI) 
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apply (simp) 
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done 
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lemma eq_diff_eq': "(x = y  z) = (y = x + (z::real))" 
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by arith 
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text{*A crude tactic to differentiate by proof.*} 
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ML 
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{* 
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local 
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val deriv_rulesI = 

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[thm "DERIV_ident", thm "DERIV_const", thm "DERIV_cos", thm "DERIV_cmult", 
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thm "DERIV_sin", thm "DERIV_exp", thm "DERIV_inverse", thm "DERIV_pow", 
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thm "DERIV_add", thm "DERIV_diff", thm "DERIV_mult", thm "DERIV_minus", 

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thm "DERIV_inverse_fun", thm "DERIV_quotient", thm "DERIV_fun_pow", 

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thm "DERIV_fun_exp", thm "DERIV_fun_sin", thm "DERIV_fun_cos", 

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thm "DERIV_ident", thm "DERIV_const", thm "DERIV_cos"]; 
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val DERIV_chain2 = thm "DERIV_chain2"; 

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in 

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exception DERIV_name; 
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fun get_fun_name (_ $ (Const ("Lim.deriv",_) $ Abs(_,_, Const (f,_) $ _) $ _ $ _)) = f 
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 get_fun_name (_ $ (_ $ (Const ("Lim.deriv",_) $ Abs(_,_, Const (f,_) $ _) $ _ $ _))) = f 
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 get_fun_name _ = raise DERIV_name; 
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val deriv_tac = 
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SUBGOAL (fn (prem,i) => 
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(resolve_tac deriv_rulesI i) ORELSE 
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((rtac (read_instantiate [("f",get_fun_name prem)] 
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DERIV_chain2) i) handle DERIV_name => no_tac));; 
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val DERIV_tac = ALLGOALS(fn i => REPEAT(deriv_tac i)); 
19765  59 

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end 

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*} 
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lemma Maclaurin_lemma2: 
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"[ \<forall>m t. m < n \<and> 0\<le>t \<and> t\<le>h \<longrightarrow> DERIV (diff m) t :> diff (Suc m) t; 
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n = Suc k; 
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difg = 
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(\<lambda>m t. diff m t  
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((\<Sum>p = 0..<n  m. diff (m + p) 0 / real (fact p) * t ^ p) + 
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B * (t ^ (n  m) / real (fact (n  m)))))] ==> 
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\<forall>m t. m < n & 0 \<le> t & t \<le> h > 
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DERIV (difg m) t :> difg (Suc m) t" 
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apply clarify 
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apply (rule DERIV_diff) 
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apply (simp (no_asm_simp)) 
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apply (tactic DERIV_tac) 
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apply (tactic DERIV_tac) 
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apply (rule_tac [2] lemma_DERIV_subst) 
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apply (rule_tac [2] DERIV_quotient) 
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apply (rule_tac [3] DERIV_const) 
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apply (rule_tac [2] DERIV_pow) 
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prefer 3 apply (simp add: fact_diff_Suc) 
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prefer 2 apply simp 
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apply (frule_tac m = m in less_add_one, clarify) 
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apply (simp del: setsum_op_ivl_Suc) 
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apply (insert sumr_offset4 [of 1]) 
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apply (simp del: setsum_op_ivl_Suc fact_Suc realpow_Suc) 
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apply (rule lemma_DERIV_subst) 
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apply (rule DERIV_add) 
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apply (rule_tac [2] DERIV_const) 
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apply (rule DERIV_sumr, clarify) 
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prefer 2 apply simp 
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apply (simp (no_asm) add: divide_inverse mult_assoc del: fact_Suc realpow_Suc) 
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apply (rule DERIV_cmult) 
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apply (rule lemma_DERIV_subst) 
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apply (best intro: DERIV_chain2 intro!: DERIV_intros) 
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apply (subst fact_Suc) 
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apply (subst real_of_nat_mult) 
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apply (simp add: mult_ac) 
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done 
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lemma Maclaurin_lemma3: 
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fixes difg :: "nat => real => real" shows 
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"[\<forall>k t. k < Suc m \<and> 0\<le>t & t\<le>h \<longrightarrow> DERIV (difg k) t :> difg (Suc k) t; 
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\<forall>k<Suc m. difg k 0 = 0; DERIV (difg n) t :> 0; n < m; 0 < t; 
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t < h] 
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==> \<exists>ta. 0 < ta & ta < t & DERIV (difg (Suc n)) ta :> 0" 
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apply (rule Rolle, assumption, simp) 
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apply (drule_tac x = n and P="%k. k<Suc m > difg k 0 = 0" in spec) 
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apply (rule DERIV_unique) 
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prefer 2 apply assumption 
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apply force 
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apply (subgoal_tac "\<forall>ta. 0 \<le> ta & ta \<le> t > (difg (Suc n)) differentiable ta") 
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apply (simp add: differentiable_def) 
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apply (blast dest!: DERIV_isCont) 
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apply (simp add: differentiable_def, clarify) 
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apply (rule_tac x = "difg (Suc (Suc n)) ta" in exI) 
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apply force 
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apply (simp add: differentiable_def, clarify) 
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apply (rule_tac x = "difg (Suc (Suc n)) x" in exI) 
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apply force 
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done 
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lemma Maclaurin: 
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"[ 0 < h; 0 < n; diff 0 = f; 
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\<forall>m t. m < n & 0 \<le> t & t \<le> h > DERIV (diff m) t :> diff (Suc m) t ] 
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==> \<exists>t. 0 < t & 
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t < h & 
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f h = 
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setsum (%m. (diff m 0 / real (fact m)) * h ^ m) {0..<n} + 
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(diff n t / real (fact n)) * h ^ n" 
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apply (case_tac "n = 0", force) 
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apply (drule not0_implies_Suc) 
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apply (erule exE) 
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apply (frule_tac f=f and n=n and j="%m. diff m 0" in Maclaurin_lemma) 
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apply (erule exE) 
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apply (subgoal_tac "\<exists>g. 
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g = (%t. f t  (setsum (%m. (diff m 0 / real(fact m)) * t^m) {0..<n} + (B * (t^n / real(fact n)))))") 
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prefer 2 apply blast 
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apply (erule exE) 
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apply (subgoal_tac "g 0 = 0 & g h =0") 
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prefer 2 
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apply (simp del: setsum_op_ivl_Suc) 
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apply (cut_tac n = m and k = 1 in sumr_offset2) 
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apply (simp add: eq_diff_eq' del: setsum_op_ivl_Suc) 
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apply (subgoal_tac "\<exists>difg. difg = (%m t. diff m t  (setsum (%p. (diff (m + p) 0 / real (fact p)) * (t ^ p)) {0..<nm} + (B * ((t ^ (n  m)) / real (fact (n  m))))))") 
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147 
prefer 2 apply blast 
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148 
apply (erule exE) 
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149 
apply (subgoal_tac "difg 0 = g") 
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150 
prefer 2 apply simp 
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151 
apply (frule Maclaurin_lemma2, assumption+) 
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152 
apply (subgoal_tac "\<forall>ma. ma < n > (\<exists>t. 0 < t & t < h & difg (Suc ma) t = 0) ") 
15234
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153 
apply (drule_tac x = m and P="%m. m<n > (\<exists>t. ?QQ m t)" in spec) 
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154 
apply (erule impE) 
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155 
apply (simp (no_asm_simp)) 
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156 
apply (erule exE) 
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157 
apply (rule_tac x = t in exI) 
15539  158 
apply (simp del: realpow_Suc fact_Suc) 
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159 
apply (subgoal_tac "\<forall>m. m < n > difg m 0 = 0") 
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160 
prefer 2 
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161 
apply clarify 
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162 
apply simp 
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163 
apply (frule_tac m = ma in less_add_one, clarify) 
15561  164 
apply (simp del: setsum_op_ivl_Suc) 
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165 
apply (insert sumr_offset4 [of 1]) 
15561  166 
apply (simp del: setsum_op_ivl_Suc fact_Suc realpow_Suc) 
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167 
apply (subgoal_tac "\<forall>m. m < n > (\<exists>t. 0 < t & t < h & DERIV (difg m) t :> 0) ") 
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168 
apply (rule allI, rule impI) 
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169 
apply (drule_tac x = ma and P="%m. m<n > (\<exists>t. ?QQ m t)" in spec) 
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170 
apply (erule impE, assumption) 
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171 
apply (erule exE) 
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172 
apply (rule_tac x = t in exI) 
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173 
(* do some tidying up *) 
15539  174 
apply (erule_tac [!] V= "difg = (%m t. diff m t  (setsum (%p. diff (m + p) 0 / real (fact p) * t ^ p) {0..<nm} + B * (t ^ (n  m) / real (fact (n  m)))))" 
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175 
in thin_rl) 
15539  176 
apply (erule_tac [!] V="g = (%t. f t  (setsum (%m. diff m 0 / real (fact m) * t ^ m) {0..<n} + B * (t ^ n / real (fact n))))" 
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177 
in thin_rl) 
15539  178 
apply (erule_tac [!] V="f h = setsum (%m. diff m 0 / real (fact m) * h ^ m) {0..<n} + B * (h ^ n / real (fact n))" 
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179 
in thin_rl) 
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180 
(* back to business *) 
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181 
apply (simp (no_asm_simp)) 
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182 
apply (rule DERIV_unique) 
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183 
prefer 2 apply blast 
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184 
apply force 
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185 
apply (rule allI, induct_tac "ma") 
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186 
apply (rule impI, rule Rolle, assumption, simp, simp) 
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187 
apply (subgoal_tac "\<forall>t. 0 \<le> t & t \<le> h > g differentiable t") 
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188 
apply (simp add: differentiable_def) 
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189 
apply (blast dest: DERIV_isCont) 
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190 
apply (simp add: differentiable_def, clarify) 
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191 
apply (rule_tac x = "difg (Suc 0) t" in exI) 
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192 
apply force 
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193 
apply (simp add: differentiable_def, clarify) 
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194 
apply (rule_tac x = "difg (Suc 0) x" in exI) 
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195 
apply force 
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196 
apply safe 
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197 
apply force 
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198 
apply (frule Maclaurin_lemma3, assumption+, safe) 
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199 
apply (rule_tac x = ta in exI, force) 
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200 
done 
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201 

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202 
lemma Maclaurin_objl: 
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"0 < h & 0 < n & diff 0 = f & 
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(\<forall>m t. m < n & 0 \<le> t & t \<le> h > DERIV (diff m) t :> diff (Suc m) t) 
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> (\<exists>t. 0 < t & 
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t < h & 
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f h = 
15539  208 
(\<Sum>m=0..<n. diff m 0 / real (fact m) * h ^ m) + 
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diff n t / real (fact n) * h ^ n)" 
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210 
by (blast intro: Maclaurin) 
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211 

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212 

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213 
lemma Maclaurin2: 
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214 
"[ 0 < h; diff 0 = f; 
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215 
\<forall>m t. 
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m < n & 0 \<le> t & t \<le> h > DERIV (diff m) t :> diff (Suc m) t ] 
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==> \<exists>t. 0 < t & 
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t \<le> h & 
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f h = 
15539  220 
(\<Sum>m=0..<n. diff m 0 / real (fact m) * h ^ m) + 
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diff n t / real (fact n) * h ^ n" 
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222 
apply (case_tac "n", auto) 
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223 
apply (drule Maclaurin, auto) 
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224 
done 
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225 

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226 
lemma Maclaurin2_objl: 
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227 
"0 < h & diff 0 = f & 
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228 
(\<forall>m t. 
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229 
m < n & 0 \<le> t & t \<le> h > DERIV (diff m) t :> diff (Suc m) t) 
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> (\<exists>t. 0 < t & 
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231 
t \<le> h & 
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232 
f h = 
15539  233 
(\<Sum>m=0..<n. diff m 0 / real (fact m) * h ^ m) + 
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234 
diff n t / real (fact n) * h ^ n)" 
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235 
by (blast intro: Maclaurin2) 
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236 

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237 
lemma Maclaurin_minus: 
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238 
"[ h < 0; 0 < n; diff 0 = f; 
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239 
\<forall>m t. m < n & h \<le> t & t \<le> 0 > DERIV (diff m) t :> diff (Suc m) t ] 
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240 
==> \<exists>t. h < t & 
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241 
t < 0 & 
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242 
f h = 
15539  243 
(\<Sum>m=0..<n. diff m 0 / real (fact m) * h ^ m) + 
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244 
diff n t / real (fact n) * h ^ n" 
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245 
apply (cut_tac f = "%x. f (x)" 
23177  246 
and diff = "%n x. (1 ^ n) * diff n (x)" 
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247 
and h = "h" and n = n in Maclaurin_objl) 
15539  248 
apply (simp) 
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249 
apply safe 
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250 
apply (subst minus_mult_right) 
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251 
apply (rule DERIV_cmult) 
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252 
apply (rule lemma_DERIV_subst) 
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253 
apply (rule DERIV_chain2 [where g=uminus]) 
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254 
apply (rule_tac [2] DERIV_minus, rule_tac [2] DERIV_ident) 
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255 
prefer 2 apply force 
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256 
apply force 
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257 
apply (rule_tac x = "t" in exI, auto) 
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258 
apply (subgoal_tac "(\<Sum>m = 0..<n. 1 ^ m * diff m 0 * (h)^m / real(fact m)) = 
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259 
(\<Sum>m = 0..<n. diff m 0 * h ^ m / real(fact m))") 
15536  260 
apply (rule_tac [2] setsum_cong[OF refl]) 
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261 
apply (auto simp add: divide_inverse power_mult_distrib [symmetric]) 
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262 
done 
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263 

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264 
lemma Maclaurin_minus_objl: 
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265 
"(h < 0 & 0 < n & diff 0 = f & 
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266 
(\<forall>m t. 
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267 
m < n & h \<le> t & t \<le> 0 > DERIV (diff m) t :> diff (Suc m) t)) 
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268 
> (\<exists>t. h < t & 
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269 
t < 0 & 
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270 
f h = 
15539  271 
(\<Sum>m=0..<n. diff m 0 / real (fact m) * h ^ m) + 
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diff n t / real (fact n) * h ^ n)" 
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273 
by (blast intro: Maclaurin_minus) 
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274 

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275 

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276 
subsection{*More Convenient "Bidirectional" Version.*} 
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277 

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278 
(* not good for PVS sin_approx, cos_approx *) 
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279 

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280 
lemma Maclaurin_bi_le_lemma [rule_format]: 
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281 
"0 < n \<longrightarrow> 
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conversion of Hyperreal/MacLaurin_lemmas to Isar script
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282 
diff 0 0 = 
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conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
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diff
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283 
(\<Sum>m = 0..<n. diff m 0 * 0 ^ m / real (fact m)) + 
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conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
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diff
changeset

284 
diff n 0 * 0 ^ n / real (fact n)" 
15251  285 
by (induct "n", auto) 
14738  286 

15079
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conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
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diff
changeset

287 
lemma Maclaurin_bi_le: 
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conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
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288 
"[ diff 0 = f; 
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conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
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diff
changeset

289 
\<forall>m t. m < n & abs t \<le> abs x > DERIV (diff m) t :> diff (Suc m) t ] 
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conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
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diff
changeset

290 
==> \<exists>t. abs t \<le> abs x & 
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conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
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changeset

291 
f x = 
15539  292 
(\<Sum>m=0..<n. diff m 0 / real (fact m) * x ^ m) + 
15079
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conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
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diff
changeset

293 
diff n t / real (fact n) * x ^ n" 
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conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
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diff
changeset

294 
apply (case_tac "n = 0", force) 
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conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
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diff
changeset

295 
apply (case_tac "x = 0") 
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conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
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diff
changeset

296 
apply (rule_tac x = 0 in exI) 
15539  297 
apply (force simp add: Maclaurin_bi_le_lemma) 
15079
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conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
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diff
changeset

298 
apply (cut_tac x = x and y = 0 in linorder_less_linear, auto) 
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
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diff
changeset

299 
txt{*Case 1, where @{term "x < 0"}*} 
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conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
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diff
changeset

300 
apply (cut_tac f = "diff 0" and diff = diff and h = x and n = n in Maclaurin_minus_objl, safe) 
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
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diff
changeset

301 
apply (simp add: abs_if) 
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conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

302 
apply (rule_tac x = t in exI) 
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conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
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diff
changeset

303 
apply (simp add: abs_if) 
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conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
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diff
changeset

304 
txt{*Case 2, where @{term "0 < x"}*} 
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conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
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diff
changeset

305 
apply (cut_tac f = "diff 0" and diff = diff and h = x and n = n in Maclaurin_objl, safe) 
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
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diff
changeset

306 
apply (simp add: abs_if) 
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conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
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diff
changeset

307 
apply (rule_tac x = t in exI) 
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conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
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diff
changeset

308 
apply (simp add: abs_if) 
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conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
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diff
changeset

309 
done 
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
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diff
changeset

310 

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conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
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diff
changeset

311 
lemma Maclaurin_all_lt: 
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conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
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diff
changeset

312 
"[ diff 0 = f; 
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conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
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diff
changeset

313 
\<forall>m x. DERIV (diff m) x :> diff(Suc m) x; 
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conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
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diff
changeset

314 
x ~= 0; 0 < n 
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

315 
] ==> \<exists>t. 0 < abs t & abs t < abs x & 
15539  316 
f x = (\<Sum>m=0..<n. (diff m 0 / real (fact m)) * x ^ m) + 
15079
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

317 
(diff n t / real (fact n)) * x ^ n" 
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

318 
apply (rule_tac x = x and y = 0 in linorder_cases) 
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

319 
prefer 2 apply blast 
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conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
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diff
changeset

320 
apply (drule_tac [2] diff=diff in Maclaurin) 
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conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

321 
apply (drule_tac diff=diff in Maclaurin_minus, simp_all, safe) 
15229  322 
apply (rule_tac [!] x = t in exI, auto) 
15079
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conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
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diff
changeset

323 
done 
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

324 

2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
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diff
changeset

325 
lemma Maclaurin_all_lt_objl: 
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conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

326 
"diff 0 = f & 
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conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

327 
(\<forall>m x. DERIV (diff m) x :> diff(Suc m) x) & 
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conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

328 
x ~= 0 & 0 < n 
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

329 
> (\<exists>t. 0 < abs t & abs t < abs x & 
15539  330 
f x = (\<Sum>m=0..<n. (diff m 0 / real (fact m)) * x ^ m) + 
15079
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

331 
(diff n t / real (fact n)) * x ^ n)" 
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

332 
by (blast intro: Maclaurin_all_lt) 
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conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

333 

2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

334 
lemma Maclaurin_zero [rule_format]: 
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conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

335 
"x = (0::real) 
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conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

336 
==> 0 < n > 
15539  337 
(\<Sum>m=0..<n. (diff m (0::real) / real (fact m)) * x ^ m) = 
15079
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

338 
diff 0 0" 
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

339 
by (induct n, auto) 
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

340 

2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
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diff
changeset

341 
lemma Maclaurin_all_le: "[ diff 0 = f; 
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conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

342 
\<forall>m x. DERIV (diff m) x :> diff (Suc m) x 
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

343 
] ==> \<exists>t. abs t \<le> abs x & 
15539  344 
f x = (\<Sum>m=0..<n. (diff m 0 / real (fact m)) * x ^ m) + 
15079
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

345 
(diff n t / real (fact n)) * x ^ n" 
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

346 
apply (insert linorder_le_less_linear [of n 0]) 
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conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

347 
apply (erule disjE, force) 
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conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

348 
apply (case_tac "x = 0") 
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

349 
apply (frule_tac diff = diff and n = n in Maclaurin_zero, assumption) 
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

350 
apply (drule gr_implies_not0 [THEN not0_implies_Suc]) 
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

351 
apply (rule_tac x = 0 in exI, force) 
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

352 
apply (frule_tac diff = diff and n = n in Maclaurin_all_lt, auto) 
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

353 
apply (rule_tac x = t in exI, auto) 
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

354 
done 
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

355 

2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

356 
lemma Maclaurin_all_le_objl: "diff 0 = f & 
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conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

357 
(\<forall>m x. DERIV (diff m) x :> diff (Suc m) x) 
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conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

358 
> (\<exists>t. abs t \<le> abs x & 
15539  359 
f x = (\<Sum>m=0..<n. (diff m 0 / real (fact m)) * x ^ m) + 
15079
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

360 
(diff n t / real (fact n)) * x ^ n)" 
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

361 
by (blast intro: Maclaurin_all_le) 
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

362 

2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

363 

2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

364 
subsection{*Version for Exponential Function*} 
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

365 

2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

366 
lemma Maclaurin_exp_lt: "[ x ~= 0; 0 < n ] 
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

367 
==> (\<exists>t. 0 < abs t & 
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

368 
abs t < abs x & 
15539  369 
exp x = (\<Sum>m=0..<n. (x ^ m) / real (fact m)) + 
15079
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

370 
(exp t / real (fact n)) * x ^ n)" 
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

371 
by (cut_tac diff = "%n. exp" and f = exp and x = x and n = n in Maclaurin_all_lt_objl, auto) 
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

372 

2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

373 

2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

374 
lemma Maclaurin_exp_le: 
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

375 
"\<exists>t. abs t \<le> abs x & 
15539  376 
exp x = (\<Sum>m=0..<n. (x ^ m) / real (fact m)) + 
15079
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

377 
(exp t / real (fact n)) * x ^ n" 
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

378 
by (cut_tac diff = "%n. exp" and f = exp and x = x and n = n in Maclaurin_all_le_objl, auto) 
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

379 

2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

380 

2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

381 
subsection{*Version for Sine Function*} 
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

382 

2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

383 
lemma MVT2: 
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

384 
"[ a < b; \<forall>x. a \<le> x & x \<le> b > DERIV f x :> f'(x) ] 
21782  385 
==> \<exists>z::real. a < z & z < b & (f b  f a = (b  a) * f'(z))" 
15079
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

386 
apply (drule MVT) 
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

387 
apply (blast intro: DERIV_isCont) 
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

388 
apply (force dest: order_less_imp_le simp add: differentiable_def) 
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

389 
apply (blast dest: DERIV_unique order_less_imp_le) 
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

390 
done 
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

391 

2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

392 
lemma mod_exhaust_less_4: 
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

393 
"m mod 4 = 0  m mod 4 = 1  m mod 4 = 2  m mod 4 = (3::nat)" 
20217
25b068a99d2b
linear arithmetic splits certain operators (e.g. min, max, abs)
webertj
parents:
19765
diff
changeset

394 
by auto 
15079
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

395 

2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

396 
lemma Suc_Suc_mult_two_diff_two [rule_format, simp]: 
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

397 
"0 < n > Suc (Suc (2 * n  2)) = 2*n" 
15251  398 
by (induct "n", auto) 
15079
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

399 

2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

400 
lemma lemma_Suc_Suc_4n_diff_2 [rule_format, simp]: 
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

401 
"0 < n > Suc (Suc (4*n  2)) = 4*n" 
15251  402 
by (induct "n", auto) 
15079
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

403 

2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

404 
lemma Suc_mult_two_diff_one [rule_format, simp]: 
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

405 
"0 < n > Suc (2 * n  1) = 2*n" 
15251  406 
by (induct "n", auto) 
15079
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

407 

15234
ec91a90c604e
simplification tweaks for better arithmetic reasoning
paulson
parents:
15229
diff
changeset

408 

ec91a90c604e
simplification tweaks for better arithmetic reasoning
paulson
parents:
15229
diff
changeset

409 
text{*It is unclear why so many variant results are needed.*} 
15079
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

410 

2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

411 
lemma Maclaurin_sin_expansion2: 
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

412 
"\<exists>t. abs t \<le> abs x & 
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

413 
sin x = 
15539  414 
(\<Sum>m=0..<n. (if even m then 0 
23177  415 
else (1 ^ ((m  Suc 0) div 2)) / real (fact m)) * 
15539  416 
x ^ m) 
15079
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

417 
+ ((sin(t + 1/2 * real (n) *pi) / real (fact n)) * x ^ n)" 
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

418 
apply (cut_tac f = sin and n = n and x = x 
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

419 
and diff = "%n x. sin (x + 1/2*real n * pi)" in Maclaurin_all_lt_objl) 
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

420 
apply safe 
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

421 
apply (simp (no_asm)) 
15539  422 
apply (simp (no_asm)) 
15079
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

423 
apply (case_tac "n", clarify, simp, simp) 
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

424 
apply (rule ccontr, simp) 
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

425 
apply (drule_tac x = x in spec, simp) 
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

426 
apply (erule ssubst) 
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

427 
apply (rule_tac x = t in exI, simp) 
15536  428 
apply (rule setsum_cong[OF refl]) 
15539  429 
apply (auto simp add: sin_zero_iff odd_Suc_mult_two_ex) 
15079
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

430 
done 
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

431 

15234
ec91a90c604e
simplification tweaks for better arithmetic reasoning
paulson
parents:
15229
diff
changeset

432 
lemma Maclaurin_sin_expansion: 
ec91a90c604e
simplification tweaks for better arithmetic reasoning
paulson
parents:
15229
diff
changeset

433 
"\<exists>t. sin x = 
15539  434 
(\<Sum>m=0..<n. (if even m then 0 
23177  435 
else (1 ^ ((m  Suc 0) div 2)) / real (fact m)) * 
15539  436 
x ^ m) 
15234
ec91a90c604e
simplification tweaks for better arithmetic reasoning
paulson
parents:
15229
diff
changeset

437 
+ ((sin(t + 1/2 * real (n) *pi) / real (fact n)) * x ^ n)" 
ec91a90c604e
simplification tweaks for better arithmetic reasoning
paulson
parents:
15229
diff
changeset

438 
apply (insert Maclaurin_sin_expansion2 [of x n]) 
ec91a90c604e
simplification tweaks for better arithmetic reasoning
paulson
parents:
15229
diff
changeset

439 
apply (blast intro: elim:); 
ec91a90c604e
simplification tweaks for better arithmetic reasoning
paulson
parents:
15229
diff
changeset

440 
done 
ec91a90c604e
simplification tweaks for better arithmetic reasoning
paulson
parents:
15229
diff
changeset

441 

ec91a90c604e
simplification tweaks for better arithmetic reasoning
paulson
parents:
15229
diff
changeset

442 

ec91a90c604e
simplification tweaks for better arithmetic reasoning
paulson
parents:
15229
diff
changeset

443 

15079
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

444 
lemma Maclaurin_sin_expansion3: 
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

445 
"[ 0 < n; 0 < x ] ==> 
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

446 
\<exists>t. 0 < t & t < x & 
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

447 
sin x = 
15539  448 
(\<Sum>m=0..<n. (if even m then 0 
23177  449 
else (1 ^ ((m  Suc 0) div 2)) / real (fact m)) * 
15539  450 
x ^ m) 
15079
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

451 
+ ((sin(t + 1/2 * real(n) *pi) / real (fact n)) * x ^ n)" 
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

452 
apply (cut_tac f = sin and n = n and h = x and diff = "%n x. sin (x + 1/2*real (n) *pi)" in Maclaurin_objl) 
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

453 
apply safe 
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

454 
apply simp 
15539  455 
apply (simp (no_asm)) 
15079
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

456 
apply (erule ssubst) 
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

457 
apply (rule_tac x = t in exI, simp) 
15536  458 
apply (rule setsum_cong[OF refl]) 
15539  459 
apply (auto simp add: sin_zero_iff odd_Suc_mult_two_ex) 
15079
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

460 
done 
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

461 

2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

462 
lemma Maclaurin_sin_expansion4: 
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

463 
"0 < x ==> 
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

464 
\<exists>t. 0 < t & t \<le> x & 
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

465 
sin x = 
15539  466 
(\<Sum>m=0..<n. (if even m then 0 
23177  467 
else (1 ^ ((m  Suc 0) div 2)) / real (fact m)) * 
15539  468 
x ^ m) 
15079
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

469 
+ ((sin(t + 1/2 * real (n) *pi) / real (fact n)) * x ^ n)" 
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

470 
apply (cut_tac f = sin and n = n and h = x and diff = "%n x. sin (x + 1/2*real (n) *pi)" in Maclaurin2_objl) 
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

471 
apply safe 
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

472 
apply simp 
15539  473 
apply (simp (no_asm)) 
15079
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

474 
apply (erule ssubst) 
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

475 
apply (rule_tac x = t in exI, simp) 
15536  476 
apply (rule setsum_cong[OF refl]) 
15539  477 
apply (auto simp add: sin_zero_iff odd_Suc_mult_two_ex) 
15079
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

478 
done 
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

479 

2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

480 

2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

481 
subsection{*Maclaurin Expansion for Cosine Function*} 
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

482 

2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

483 
lemma sumr_cos_zero_one [simp]: 
15539  484 
"(\<Sum>m=0..<(Suc n). 
23177  485 
(if even m then 1 ^ (m div 2)/(real (fact m)) else 0) * 0 ^ m) = 1" 
15251  486 
by (induct "n", auto) 
15079
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

487 

2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

488 
lemma Maclaurin_cos_expansion: 
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

489 
"\<exists>t. abs t \<le> abs x & 
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

490 
cos x = 
15539  491 
(\<Sum>m=0..<n. (if even m 
23177  492 
then 1 ^ (m div 2)/(real (fact m)) 
15079
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

493 
else 0) * 
15539  494 
x ^ m) 
15079
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

495 
+ ((cos(t + 1/2 * real (n) *pi) / real (fact n)) * x ^ n)" 
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

496 
apply (cut_tac f = cos and n = n and x = x and diff = "%n x. cos (x + 1/2*real (n) *pi)" in Maclaurin_all_lt_objl) 
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

497 
apply safe 
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

498 
apply (simp (no_asm)) 
15539  499 
apply (simp (no_asm)) 
15079
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

500 
apply (case_tac "n", simp) 
15561  501 
apply (simp del: setsum_op_ivl_Suc) 
15079
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

502 
apply (rule ccontr, simp) 
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

503 
apply (drule_tac x = x in spec, simp) 
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

504 
apply (erule ssubst) 
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

505 
apply (rule_tac x = t in exI, simp) 
15536  506 
apply (rule setsum_cong[OF refl]) 
15234
ec91a90c604e
simplification tweaks for better arithmetic reasoning
paulson
parents:
15229
diff
changeset

507 
apply (auto simp add: cos_zero_iff even_mult_two_ex) 
15079
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

508 
done 
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

509 

2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

510 
lemma Maclaurin_cos_expansion2: 
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

511 
"[ 0 < x; 0 < n ] ==> 
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

512 
\<exists>t. 0 < t & t < x & 
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

513 
cos x = 
15539  514 
(\<Sum>m=0..<n. (if even m 
23177  515 
then 1 ^ (m div 2)/(real (fact m)) 
15079
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

516 
else 0) * 
15539  517 
x ^ m) 
15079
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

518 
+ ((cos(t + 1/2 * real (n) *pi) / real (fact n)) * x ^ n)" 
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

519 
apply (cut_tac f = cos and n = n and h = x and diff = "%n x. cos (x + 1/2*real (n) *pi)" in Maclaurin_objl) 
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

520 
apply safe 
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

521 
apply simp 
15539  522 
apply (simp (no_asm)) 
15079
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

523 
apply (erule ssubst) 
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

524 
apply (rule_tac x = t in exI, simp) 
15536  525 
apply (rule setsum_cong[OF refl]) 
15234
ec91a90c604e
simplification tweaks for better arithmetic reasoning
paulson
parents:
15229
diff
changeset

526 
apply (auto simp add: cos_zero_iff even_mult_two_ex) 
15079
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

527 
done 
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

528 

15234
ec91a90c604e
simplification tweaks for better arithmetic reasoning
paulson
parents:
15229
diff
changeset

529 
lemma Maclaurin_minus_cos_expansion: 
ec91a90c604e
simplification tweaks for better arithmetic reasoning
paulson
parents:
15229
diff
changeset

530 
"[ x < 0; 0 < n ] ==> 
15079
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

531 
\<exists>t. x < t & t < 0 & 
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

532 
cos x = 
15539  533 
(\<Sum>m=0..<n. (if even m 
23177  534 
then 1 ^ (m div 2)/(real (fact m)) 
15079
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

535 
else 0) * 
15539  536 
x ^ m) 
15079
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

537 
+ ((cos(t + 1/2 * real (n) *pi) / real (fact n)) * x ^ n)" 
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

538 
apply (cut_tac f = cos and n = n and h = x and diff = "%n x. cos (x + 1/2*real (n) *pi)" in Maclaurin_minus_objl) 
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

539 
apply safe 
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

540 
apply simp 
15539  541 
apply (simp (no_asm)) 
15079
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

542 
apply (erule ssubst) 
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

543 
apply (rule_tac x = t in exI, simp) 
15536  544 
apply (rule setsum_cong[OF refl]) 
15234
ec91a90c604e
simplification tweaks for better arithmetic reasoning
paulson
parents:
15229
diff
changeset

545 
apply (auto simp add: cos_zero_iff even_mult_two_ex) 
15079
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

546 
done 
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

547 

2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

548 
(*  *) 
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

549 
(* Version for ln(1 +/ x). Where is it?? *) 
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

550 
(*  *) 
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

551 

2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

552 
lemma sin_bound_lemma: 
15081  553 
"[x = y; abs u \<le> (v::real) ] ==> \<bar>(x + u)  y\<bar> \<le> v" 
15079
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

554 
by auto 
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

555 

2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

556 
lemma Maclaurin_sin_bound: 
23177  557 
"abs(sin x  (\<Sum>m=0..<n. (if even m then 0 else (1 ^ ((m  Suc 0) div 2)) / real (fact m)) * 
15081  558 
x ^ m)) \<le> inverse(real (fact n)) * \<bar>x\<bar> ^ n" 
14738  559 
proof  
15079
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

560 
have "!! x (y::real). x \<le> 1 \<Longrightarrow> 0 \<le> y \<Longrightarrow> x * y \<le> 1 * y" 
14738  561 
by (rule_tac mult_right_mono,simp_all) 
562 
note est = this[simplified] 

22985  563 
let ?diff = "\<lambda>(n::nat) x. if n mod 4 = 0 then sin(x) else if n mod 4 = 1 then cos(x) else if n mod 4 = 2 then sin(x) else cos(x)" 
564 
have diff_0: "?diff 0 = sin" by simp 

565 
have DERIV_diff: "\<forall>m x. DERIV (?diff m) x :> ?diff (Suc m) x" 

566 
apply (clarify) 

567 
apply (subst (1 2 3) mod_Suc_eq_Suc_mod) 

568 
apply (cut_tac m=m in mod_exhaust_less_4) 

569 
apply (safe, simp_all) 

570 
apply (rule DERIV_minus, simp) 

571 
apply (rule lemma_DERIV_subst, rule DERIV_minus, rule DERIV_cos, simp) 

572 
done 

573 
from Maclaurin_all_le [OF diff_0 DERIV_diff] 

574 
obtain t where t1: "\<bar>t\<bar> \<le> \<bar>x\<bar>" and 

575 
t2: "sin x = (\<Sum>m = 0..<n. ?diff m 0 / real (fact m) * x ^ m) + 

576 
?diff n t / real (fact n) * x ^ n" by fast 

577 
have diff_m_0: 

578 
"\<And>m. ?diff m 0 = (if even m then 0 

23177  579 
else 1 ^ ((m  Suc 0) div 2))" 
22985  580 
apply (subst even_even_mod_4_iff) 
581 
apply (cut_tac m=m in mod_exhaust_less_4) 

582 
apply (elim disjE, simp_all) 

583 
apply (safe dest!: mod_eqD, simp_all) 

584 
done 

14738  585 
show ?thesis 
22985  586 
apply (subst t2) 
15079
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

587 
apply (rule sin_bound_lemma) 
15536  588 
apply (rule setsum_cong[OF refl]) 
22985  589 
apply (subst diff_m_0, simp) 
15079
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

590 
apply (auto intro: mult_right_mono [where b=1, simplified] mult_right_mono 
16775
c1b87ef4a1c3
added lemmas to OrderedGroup.thy (reasoning about signs, absolute value, triangle inequalities)
avigad
parents:
15944
diff
changeset

591 
simp add: est mult_nonneg_nonneg mult_ac divide_inverse 
16924  592 
power_abs [symmetric] abs_mult) 
14738  593 
done 
594 
qed 

595 

15079
2ef899e4526d
conversion of Hyperreal/MacLaurin_lemmas to Isar script
paulson
parents:
14738
diff
changeset

596 
end 