author  huffman 
Fri, 22 Sep 2006 23:17:39 +0200  
changeset 20684  74e8b46abb97 
parent 20584  60b1d52a455d 
child 20694  76c49548d14c 
permissions  rwrr 
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(* Title : RealVector.thy 
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ID: $Id$ 
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Author : Brian Huffman 
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*) 
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header {* Vector Spaces and Algebras over the Reals *} 
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theory RealVector 
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imports RealPow 
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begin 
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subsection {* Locale for additive functions *} 
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locale additive = 
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fixes f :: "'a::ab_group_add \<Rightarrow> 'b::ab_group_add" 
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assumes add: "f (x + y) = f x + f y" 
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lemma (in additive) zero: "f 0 = 0" 
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proof  
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have "f 0 = f (0 + 0)" by simp 
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also have "\<dots> = f 0 + f 0" by (rule add) 
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finally show "f 0 = 0" by simp 
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qed 
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lemma (in additive) minus: "f ( x) =  f x" 
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proof  
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have "f ( x) + f x = f ( x + x)" by (rule add [symmetric]) 
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also have "\<dots> =  f x + f x" by (simp add: zero) 
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finally show "f ( x) =  f x" by (rule add_right_imp_eq) 
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qed 
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lemma (in additive) diff: "f (x  y) = f x  f y" 
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by (simp add: diff_def add minus) 
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subsection {* Real vector spaces *} 
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axclass scaleR < type 
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consts 
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scaleR :: "real \<Rightarrow> 'a \<Rightarrow> 'a::scaleR" (infixr "*#" 75) 
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syntax (xsymbols) 
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scaleR :: "real \<Rightarrow> 'a \<Rightarrow> 'a::scaleR" (infixr "*\<^sub>R" 75) 
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instance real :: scaleR .. 
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defs (overloaded) 
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real_scaleR_def: "a *# x \<equiv> a * x" 
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axclass real_vector < scaleR, ab_group_add 
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scaleR_right_distrib: "a *# (x + y) = a *# x + a *# y" 
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scaleR_left_distrib: "(a + b) *# x = a *# x + b *# x" 
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scaleR_assoc: "(a * b) *# x = a *# b *# x" 
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scaleR_one [simp]: "1 *# x = x" 
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axclass real_algebra < real_vector, ring 
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mult_scaleR_left: "a *# x * y = a *# (x * y)" 
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mult_scaleR_right: "x * a *# y = a *# (x * y)" 
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axclass real_algebra_1 < real_algebra, ring_1 
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axclass real_div_algebra < real_algebra_1, division_ring 
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axclass real_field < real_div_algebra, field 
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instance real :: real_field 
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apply (intro_classes, unfold real_scaleR_def) 
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apply (rule right_distrib) 
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apply (rule left_distrib) 
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apply (rule mult_assoc) 
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apply (rule mult_1_left) 
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apply (rule mult_assoc) 
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apply (rule mult_left_commute) 
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done 
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lemmas scaleR_scaleR = scaleR_assoc [symmetric] 
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lemma scaleR_left_commute: 
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fixes x :: "'a::real_vector" 
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shows "a *# b *# x = b *# a *# x" 
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by (simp add: scaleR_scaleR mult_commute) 
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83 

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lemma additive_scaleR_right: "additive (\<lambda>x. a *# x :: 'a::real_vector)" 
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by (rule additive.intro, rule scaleR_right_distrib) 
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lemma additive_scaleR_left: "additive (\<lambda>a. a *# x :: 'a::real_vector)" 
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by (rule additive.intro, rule scaleR_left_distrib) 
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lemmas scaleR_zero_left [simp] = 
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additive.zero [OF additive_scaleR_left, standard] 
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lemmas scaleR_zero_right [simp] = 
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additive.zero [OF additive_scaleR_right, standard] 
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lemmas scaleR_minus_left [simp] = 
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additive.minus [OF additive_scaleR_left, standard] 
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lemmas scaleR_minus_right [simp] = 
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additive.minus [OF additive_scaleR_right, standard] 
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lemmas scaleR_left_diff_distrib = 
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additive.diff [OF additive_scaleR_left, standard] 
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lemmas scaleR_right_diff_distrib = 
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additive.diff [OF additive_scaleR_right, standard] 
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lemma scaleR_eq_0_iff: 
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fixes x :: "'a::real_vector" 
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shows "(a *# x = 0) = (a = 0 \<or> x = 0)" 
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proof cases 
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assume "a = 0" thus ?thesis by simp 
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next 
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assume anz [simp]: "a \<noteq> 0" 
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{ assume "a *# x = 0" 
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hence "inverse a *# a *# x = 0" by simp 
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hence "x = 0" by (simp (no_asm_use) add: scaleR_scaleR)} 
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thus ?thesis by force 
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qed 
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lemma scaleR_left_imp_eq: 
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fixes x y :: "'a::real_vector" 
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shows "\<lbrakk>a \<noteq> 0; a *# x = a *# y\<rbrakk> \<Longrightarrow> x = y" 
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proof  
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assume nonzero: "a \<noteq> 0" 
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assume "a *# x = a *# y" 
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hence "a *# (x  y) = 0" 
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by (simp add: scaleR_right_diff_distrib) 
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hence "x  y = 0" 
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by (simp add: scaleR_eq_0_iff nonzero) 
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thus "x = y" by simp 
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qed 
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lemma scaleR_right_imp_eq: 
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fixes x y :: "'a::real_vector" 
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shows "\<lbrakk>x \<noteq> 0; a *# x = b *# x\<rbrakk> \<Longrightarrow> a = b" 
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proof  
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assume nonzero: "x \<noteq> 0" 
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assume "a *# x = b *# x" 
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hence "(a  b) *# x = 0" 
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by (simp add: scaleR_left_diff_distrib) 
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hence "a  b = 0" 
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by (simp add: scaleR_eq_0_iff nonzero) 
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thus "a = b" by simp 
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qed 
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147 
lemma scaleR_cancel_left: 
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148 
fixes x y :: "'a::real_vector" 
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149 
shows "(a *# x = a *# y) = (x = y \<or> a = 0)" 
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150 
by (auto intro: scaleR_left_imp_eq) 
c433e78d4203
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151 

c433e78d4203
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152 
lemma scaleR_cancel_right: 
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153 
fixes x y :: "'a::real_vector" 
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154 
shows "(a *# x = b *# x) = (a = b \<or> x = 0)" 
c433e78d4203
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155 
by (auto intro: scaleR_right_imp_eq) 
c433e78d4203
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156 

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157 
lemma nonzero_inverse_scaleR_distrib: 
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158 
fixes x :: "'a::real_div_algebra" 
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159 
shows "\<lbrakk>a \<noteq> 0; x \<noteq> 0\<rbrakk> \<Longrightarrow> inverse (a *# x) = inverse a *# inverse x" 
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160 
apply (rule inverse_unique) 
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161 
apply (simp add: mult_scaleR_left mult_scaleR_right scaleR_scaleR) 
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162 
done 
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163 

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164 
lemma inverse_scaleR_distrib: 
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165 
fixes x :: "'a::{real_div_algebra,division_by_zero}" 
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166 
shows "inverse (a *# x) = inverse a *# inverse x" 
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167 
apply (case_tac "a = 0", simp) 
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168 
apply (case_tac "x = 0", simp) 
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169 
apply (erule (1) nonzero_inverse_scaleR_distrib) 
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170 
done 
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171 

20554
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172 

c433e78d4203
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173 
subsection {* Embedding of the Reals into any @{text real_algebra_1}: 
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174 
@{term of_real} *} 
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175 

c433e78d4203
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176 
definition 
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177 
of_real :: "real \<Rightarrow> 'a::real_algebra_1" 
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178 
"of_real r = r *# 1" 
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179 

c433e78d4203
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180 
lemma of_real_0 [simp]: "of_real 0 = 0" 
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181 
by (simp add: of_real_def) 
c433e78d4203
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182 

c433e78d4203
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183 
lemma of_real_1 [simp]: "of_real 1 = 1" 
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184 
by (simp add: of_real_def) 
c433e78d4203
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185 

c433e78d4203
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186 
lemma of_real_add [simp]: "of_real (x + y) = of_real x + of_real y" 
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187 
by (simp add: of_real_def scaleR_left_distrib) 
c433e78d4203
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188 

c433e78d4203
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189 
lemma of_real_minus [simp]: "of_real ( x) =  of_real x" 
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190 
by (simp add: of_real_def) 
c433e78d4203
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191 

c433e78d4203
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192 
lemma of_real_diff [simp]: "of_real (x  y) = of_real x  of_real y" 
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193 
by (simp add: of_real_def scaleR_left_diff_distrib) 
c433e78d4203
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194 

c433e78d4203
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195 
lemma of_real_mult [simp]: "of_real (x * y) = of_real x * of_real y" 
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196 
by (simp add: of_real_def mult_scaleR_left scaleR_scaleR) 
c433e78d4203
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197 

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198 
lemma nonzero_of_real_inverse: 
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199 
"x \<noteq> 0 \<Longrightarrow> of_real (inverse x) = 
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200 
inverse (of_real x :: 'a::real_div_algebra)" 
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201 
by (simp add: of_real_def nonzero_inverse_scaleR_distrib) 
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202 

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203 
lemma of_real_inverse [simp]: 
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204 
"of_real (inverse x) = 
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205 
inverse (of_real x :: 'a::{real_div_algebra,division_by_zero})" 
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206 
by (simp add: of_real_def inverse_scaleR_distrib) 
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207 

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208 
lemma nonzero_of_real_divide: 
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209 
"y \<noteq> 0 \<Longrightarrow> of_real (x / y) = 
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210 
(of_real x / of_real y :: 'a::real_field)" 
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211 
by (simp add: divide_inverse nonzero_of_real_inverse) 
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212 

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213 
lemma of_real_divide: 
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214 
"of_real (x / y) = 
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215 
(of_real x / of_real y :: 'a::{real_field,division_by_zero})" 
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216 
by (simp add: divide_inverse) 
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217 

20554
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218 
lemma of_real_eq_iff [simp]: "(of_real x = of_real y) = (x = y)" 
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219 
by (simp add: of_real_def scaleR_cancel_right) 
c433e78d4203
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220 

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221 
lemmas of_real_eq_0_iff [simp] = of_real_eq_iff [of _ 0, simplified] 
20554
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222 

c433e78d4203
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223 
lemma of_real_eq_id [simp]: "of_real = (id :: real \<Rightarrow> real)" 
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224 
proof 
c433e78d4203
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225 
fix r 
c433e78d4203
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226 
show "of_real r = id r" 
c433e78d4203
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227 
by (simp add: of_real_def real_scaleR_def) 
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228 
qed 
c433e78d4203
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229 

c433e78d4203
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230 
text{*Collapse nested embeddings*} 
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231 
lemma of_real_of_nat_eq [simp]: "of_real (of_nat n) = of_nat n" 
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232 
by (induct n, auto) 
c433e78d4203
define new constant of_real for class real_algebra_1;
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233 

c433e78d4203
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234 
lemma of_real_of_int_eq [simp]: "of_real (of_int z) = of_int z" 
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235 
by (cases z rule: int_diff_cases, simp) 
c433e78d4203
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236 

c433e78d4203
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237 
lemma of_real_number_of_eq: 
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238 
"of_real (number_of w) = (number_of w :: 'a::{number_ring,real_algebra_1})" 
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239 
by (simp add: number_of_eq) 
c433e78d4203
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240 

c433e78d4203
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241 

c433e78d4203
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242 
subsection {* The Set of Real Numbers *} 
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243 

c433e78d4203
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244 
constdefs 
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245 
Reals :: "'a::real_algebra_1 set" 
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246 
"Reals \<equiv> range of_real" 
c433e78d4203
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247 

c433e78d4203
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248 
const_syntax (xsymbols) 
c433e78d4203
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249 
Reals ("\<real>") 
c433e78d4203
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250 

c433e78d4203
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251 
lemma of_real_in_Reals [simp]: "of_real r \<in> Reals" 
c433e78d4203
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252 
by (simp add: Reals_def) 
c433e78d4203
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253 

c433e78d4203
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254 
lemma Reals_0 [simp]: "0 \<in> Reals" 
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255 
apply (unfold Reals_def) 
c433e78d4203
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256 
apply (rule range_eqI) 
c433e78d4203
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257 
apply (rule of_real_0 [symmetric]) 
c433e78d4203
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258 
done 
c433e78d4203
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259 

c433e78d4203
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260 
lemma Reals_1 [simp]: "1 \<in> Reals" 
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261 
apply (unfold Reals_def) 
c433e78d4203
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262 
apply (rule range_eqI) 
c433e78d4203
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263 
apply (rule of_real_1 [symmetric]) 
c433e78d4203
define new constant of_real for class real_algebra_1;
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264 
done 
c433e78d4203
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265 

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266 
lemma Reals_add [simp]: "\<lbrakk>a \<in> Reals; b \<in> Reals\<rbrakk> \<Longrightarrow> a + b \<in> Reals" 
20554
c433e78d4203
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267 
apply (auto simp add: Reals_def) 
c433e78d4203
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268 
apply (rule range_eqI) 
c433e78d4203
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269 
apply (rule of_real_add [symmetric]) 
c433e78d4203
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270 
done 
c433e78d4203
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271 

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272 
lemma Reals_minus [simp]: "a \<in> Reals \<Longrightarrow>  a \<in> Reals" 
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273 
apply (auto simp add: Reals_def) 
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274 
apply (rule range_eqI) 
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275 
apply (rule of_real_minus [symmetric]) 
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276 
done 
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277 

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278 
lemma Reals_diff [simp]: "\<lbrakk>a \<in> Reals; b \<in> Reals\<rbrakk> \<Longrightarrow> a  b \<in> Reals" 
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changeset

279 
apply (auto simp add: Reals_def) 
60b1d52a455d
added classes real_div_algebra and real_field; added lemmas
huffman
parents:
20560
diff
changeset

280 
apply (rule range_eqI) 
60b1d52a455d
added classes real_div_algebra and real_field; added lemmas
huffman
parents:
20560
diff
changeset

281 
apply (rule of_real_diff [symmetric]) 
60b1d52a455d
added classes real_div_algebra and real_field; added lemmas
huffman
parents:
20560
diff
changeset

282 
done 
60b1d52a455d
added classes real_div_algebra and real_field; added lemmas
huffman
parents:
20560
diff
changeset

283 

60b1d52a455d
added classes real_div_algebra and real_field; added lemmas
huffman
parents:
20560
diff
changeset

284 
lemma Reals_mult [simp]: "\<lbrakk>a \<in> Reals; b \<in> Reals\<rbrakk> \<Longrightarrow> a * b \<in> Reals" 
20554
c433e78d4203
define new constant of_real for class real_algebra_1;
huffman
parents:
20551
diff
changeset

285 
apply (auto simp add: Reals_def) 
c433e78d4203
define new constant of_real for class real_algebra_1;
huffman
parents:
20551
diff
changeset

286 
apply (rule range_eqI) 
c433e78d4203
define new constant of_real for class real_algebra_1;
huffman
parents:
20551
diff
changeset

287 
apply (rule of_real_mult [symmetric]) 
c433e78d4203
define new constant of_real for class real_algebra_1;
huffman
parents:
20551
diff
changeset

288 
done 
c433e78d4203
define new constant of_real for class real_algebra_1;
huffman
parents:
20551
diff
changeset

289 

20584
60b1d52a455d
added classes real_div_algebra and real_field; added lemmas
huffman
parents:
20560
diff
changeset

290 
lemma nonzero_Reals_inverse: 
60b1d52a455d
added classes real_div_algebra and real_field; added lemmas
huffman
parents:
20560
diff
changeset

291 
fixes a :: "'a::real_div_algebra" 
60b1d52a455d
added classes real_div_algebra and real_field; added lemmas
huffman
parents:
20560
diff
changeset

292 
shows "\<lbrakk>a \<in> Reals; a \<noteq> 0\<rbrakk> \<Longrightarrow> inverse a \<in> Reals" 
60b1d52a455d
added classes real_div_algebra and real_field; added lemmas
huffman
parents:
20560
diff
changeset

293 
apply (auto simp add: Reals_def) 
60b1d52a455d
added classes real_div_algebra and real_field; added lemmas
huffman
parents:
20560
diff
changeset

294 
apply (rule range_eqI) 
60b1d52a455d
added classes real_div_algebra and real_field; added lemmas
huffman
parents:
20560
diff
changeset

295 
apply (erule nonzero_of_real_inverse [symmetric]) 
60b1d52a455d
added classes real_div_algebra and real_field; added lemmas
huffman
parents:
20560
diff
changeset

296 
done 
60b1d52a455d
added classes real_div_algebra and real_field; added lemmas
huffman
parents:
20560
diff
changeset

297 

60b1d52a455d
added classes real_div_algebra and real_field; added lemmas
huffman
parents:
20560
diff
changeset

298 
lemma Reals_inverse [simp]: 
60b1d52a455d
added classes real_div_algebra and real_field; added lemmas
huffman
parents:
20560
diff
changeset

299 
fixes a :: "'a::{real_div_algebra,division_by_zero}" 
60b1d52a455d
added classes real_div_algebra and real_field; added lemmas
huffman
parents:
20560
diff
changeset

300 
shows "a \<in> Reals \<Longrightarrow> inverse a \<in> Reals" 
60b1d52a455d
added classes real_div_algebra and real_field; added lemmas
huffman
parents:
20560
diff
changeset

301 
apply (auto simp add: Reals_def) 
60b1d52a455d
added classes real_div_algebra and real_field; added lemmas
huffman
parents:
20560
diff
changeset

302 
apply (rule range_eqI) 
60b1d52a455d
added classes real_div_algebra and real_field; added lemmas
huffman
parents:
20560
diff
changeset

303 
apply (rule of_real_inverse [symmetric]) 
60b1d52a455d
added classes real_div_algebra and real_field; added lemmas
huffman
parents:
20560
diff
changeset

304 
done 
60b1d52a455d
added classes real_div_algebra and real_field; added lemmas
huffman
parents:
20560
diff
changeset

305 

60b1d52a455d
added classes real_div_algebra and real_field; added lemmas
huffman
parents:
20560
diff
changeset

306 
lemma nonzero_Reals_divide: 
60b1d52a455d
added classes real_div_algebra and real_field; added lemmas
huffman
parents:
20560
diff
changeset

307 
fixes a b :: "'a::real_field" 
60b1d52a455d
added classes real_div_algebra and real_field; added lemmas
huffman
parents:
20560
diff
changeset

308 
shows "\<lbrakk>a \<in> Reals; b \<in> Reals; b \<noteq> 0\<rbrakk> \<Longrightarrow> a / b \<in> Reals" 
60b1d52a455d
added classes real_div_algebra and real_field; added lemmas
huffman
parents:
20560
diff
changeset

309 
apply (auto simp add: Reals_def) 
60b1d52a455d
added classes real_div_algebra and real_field; added lemmas
huffman
parents:
20560
diff
changeset

310 
apply (rule range_eqI) 
60b1d52a455d
added classes real_div_algebra and real_field; added lemmas
huffman
parents:
20560
diff
changeset

311 
apply (erule nonzero_of_real_divide [symmetric]) 
60b1d52a455d
added classes real_div_algebra and real_field; added lemmas
huffman
parents:
20560
diff
changeset

312 
done 
60b1d52a455d
added classes real_div_algebra and real_field; added lemmas
huffman
parents:
20560
diff
changeset

313 

60b1d52a455d
added classes real_div_algebra and real_field; added lemmas
huffman
parents:
20560
diff
changeset

314 
lemma Reals_divide [simp]: 
60b1d52a455d
added classes real_div_algebra and real_field; added lemmas
huffman
parents:
20560
diff
changeset

315 
fixes a b :: "'a::{real_field,division_by_zero}" 
60b1d52a455d
added classes real_div_algebra and real_field; added lemmas
huffman
parents:
20560
diff
changeset

316 
shows "\<lbrakk>a \<in> Reals; b \<in> Reals\<rbrakk> \<Longrightarrow> a / b \<in> Reals" 
60b1d52a455d
added classes real_div_algebra and real_field; added lemmas
huffman
parents:
20560
diff
changeset

317 
apply (auto simp add: Reals_def) 
60b1d52a455d
added classes real_div_algebra and real_field; added lemmas
huffman
parents:
20560
diff
changeset

318 
apply (rule range_eqI) 
60b1d52a455d
added classes real_div_algebra and real_field; added lemmas
huffman
parents:
20560
diff
changeset

319 
apply (rule of_real_divide [symmetric]) 
60b1d52a455d
added classes real_div_algebra and real_field; added lemmas
huffman
parents:
20560
diff
changeset

320 
done 
60b1d52a455d
added classes real_div_algebra and real_field; added lemmas
huffman
parents:
20560
diff
changeset

321 

20554
c433e78d4203
define new constant of_real for class real_algebra_1;
huffman
parents:
20551
diff
changeset

322 
lemma Reals_cases [cases set: Reals]: 
c433e78d4203
define new constant of_real for class real_algebra_1;
huffman
parents:
20551
diff
changeset

323 
assumes "q \<in> \<real>" 
c433e78d4203
define new constant of_real for class real_algebra_1;
huffman
parents:
20551
diff
changeset

324 
obtains (of_real) r where "q = of_real r" 
c433e78d4203
define new constant of_real for class real_algebra_1;
huffman
parents:
20551
diff
changeset

325 
unfolding Reals_def 
c433e78d4203
define new constant of_real for class real_algebra_1;
huffman
parents:
20551
diff
changeset

326 
proof  
c433e78d4203
define new constant of_real for class real_algebra_1;
huffman
parents:
20551
diff
changeset

327 
from `q \<in> \<real>` have "q \<in> range of_real" unfolding Reals_def . 
c433e78d4203
define new constant of_real for class real_algebra_1;
huffman
parents:
20551
diff
changeset

328 
then obtain r where "q = of_real r" .. 
c433e78d4203
define new constant of_real for class real_algebra_1;
huffman
parents:
20551
diff
changeset

329 
then show thesis .. 
c433e78d4203
define new constant of_real for class real_algebra_1;
huffman
parents:
20551
diff
changeset

330 
qed 
c433e78d4203
define new constant of_real for class real_algebra_1;
huffman
parents:
20551
diff
changeset

331 

c433e78d4203
define new constant of_real for class real_algebra_1;
huffman
parents:
20551
diff
changeset

332 
lemma Reals_induct [case_names of_real, induct set: Reals]: 
c433e78d4203
define new constant of_real for class real_algebra_1;
huffman
parents:
20551
diff
changeset

333 
"q \<in> \<real> \<Longrightarrow> (\<And>r. P (of_real r)) \<Longrightarrow> P q" 
c433e78d4203
define new constant of_real for class real_algebra_1;
huffman
parents:
20551
diff
changeset

334 
by (rule Reals_cases) auto 
c433e78d4203
define new constant of_real for class real_algebra_1;
huffman
parents:
20551
diff
changeset

335 

20504
6342e872e71d
formalization of vector spaces and algebras over the real numbers
huffman
parents:
diff
changeset

336 

6342e872e71d
formalization of vector spaces and algebras over the real numbers
huffman
parents:
diff
changeset

337 
subsection {* Real normed vector spaces *} 
6342e872e71d
formalization of vector spaces and algebras over the real numbers
huffman
parents:
diff
changeset

338 

6342e872e71d
formalization of vector spaces and algebras over the real numbers
huffman
parents:
diff
changeset

339 
axclass norm < type 
20533  340 
consts norm :: "'a::norm \<Rightarrow> real" 
20504
6342e872e71d
formalization of vector spaces and algebras over the real numbers
huffman
parents:
diff
changeset

341 

20554
c433e78d4203
define new constant of_real for class real_algebra_1;
huffman
parents:
20551
diff
changeset

342 
instance real :: norm .. 
c433e78d4203
define new constant of_real for class real_algebra_1;
huffman
parents:
20551
diff
changeset

343 

c433e78d4203
define new constant of_real for class real_algebra_1;
huffman
parents:
20551
diff
changeset

344 
defs (overloaded) 
c433e78d4203
define new constant of_real for class real_algebra_1;
huffman
parents:
20551
diff
changeset

345 
real_norm_def: "norm r \<equiv> \<bar>r\<bar>" 
c433e78d4203
define new constant of_real for class real_algebra_1;
huffman
parents:
20551
diff
changeset

346 

c433e78d4203
define new constant of_real for class real_algebra_1;
huffman
parents:
20551
diff
changeset

347 
axclass normed < plus, zero, norm 
20533  348 
norm_ge_zero [simp]: "0 \<le> norm x" 
349 
norm_eq_zero [simp]: "(norm x = 0) = (x = 0)" 

350 
norm_triangle_ineq: "norm (x + y) \<le> norm x + norm y" 

20554
c433e78d4203
define new constant of_real for class real_algebra_1;
huffman
parents:
20551
diff
changeset

351 

c433e78d4203
define new constant of_real for class real_algebra_1;
huffman
parents:
20551
diff
changeset

352 
axclass real_normed_vector < real_vector, normed 
20533  353 
norm_scaleR: "norm (a *# x) = \<bar>a\<bar> * norm x" 
20504
6342e872e71d
formalization of vector spaces and algebras over the real numbers
huffman
parents:
diff
changeset

354 

20584
60b1d52a455d
added classes real_div_algebra and real_field; added lemmas
huffman
parents:
20560
diff
changeset

355 
axclass real_normed_algebra < real_algebra, real_normed_vector 
20533  356 
norm_mult_ineq: "norm (x * y) \<le> norm x * norm y" 
20504
6342e872e71d
formalization of vector spaces and algebras over the real numbers
huffman
parents:
diff
changeset

357 

20584
60b1d52a455d
added classes real_div_algebra and real_field; added lemmas
huffman
parents:
20560
diff
changeset

358 
axclass real_normed_div_algebra < real_div_algebra, normed 
20554
c433e78d4203
define new constant of_real for class real_algebra_1;
huffman
parents:
20551
diff
changeset

359 
norm_of_real: "norm (of_real r) = abs r" 
20533  360 
norm_mult: "norm (x * y) = norm x * norm y" 
20504
6342e872e71d
formalization of vector spaces and algebras over the real numbers
huffman
parents:
diff
changeset

361 

20584
60b1d52a455d
added classes real_div_algebra and real_field; added lemmas
huffman
parents:
20560
diff
changeset

362 
axclass real_normed_field < real_field, real_normed_div_algebra 
60b1d52a455d
added classes real_div_algebra and real_field; added lemmas
huffman
parents:
20560
diff
changeset

363 

20504
6342e872e71d
formalization of vector spaces and algebras over the real numbers
huffman
parents:
diff
changeset

364 
instance real_normed_div_algebra < real_normed_algebra 
20554
c433e78d4203
define new constant of_real for class real_algebra_1;
huffman
parents:
20551
diff
changeset

365 
proof 
c433e78d4203
define new constant of_real for class real_algebra_1;
huffman
parents:
20551
diff
changeset

366 
fix a :: real and x :: 'a 
c433e78d4203
define new constant of_real for class real_algebra_1;
huffman
parents:
20551
diff
changeset

367 
have "norm (a *# x) = norm (of_real a * x)" 
c433e78d4203
define new constant of_real for class real_algebra_1;
huffman
parents:
20551
diff
changeset

368 
by (simp add: of_real_def mult_scaleR_left) 
c433e78d4203
define new constant of_real for class real_algebra_1;
huffman
parents:
20551
diff
changeset

369 
also have "\<dots> = abs a * norm x" 
c433e78d4203
define new constant of_real for class real_algebra_1;
huffman
parents:
20551
diff
changeset

370 
by (simp add: norm_mult norm_of_real) 
c433e78d4203
define new constant of_real for class real_algebra_1;
huffman
parents:
20551
diff
changeset

371 
finally show "norm (a *# x) = abs a * norm x" . 
c433e78d4203
define new constant of_real for class real_algebra_1;
huffman
parents:
20551
diff
changeset

372 
next 
c433e78d4203
define new constant of_real for class real_algebra_1;
huffman
parents:
20551
diff
changeset

373 
fix x y :: 'a 
c433e78d4203
define new constant of_real for class real_algebra_1;
huffman
parents:
20551
diff
changeset

374 
show "norm (x * y) \<le> norm x * norm y" 
c433e78d4203
define new constant of_real for class real_algebra_1;
huffman
parents:
20551
diff
changeset

375 
by (simp add: norm_mult) 
c433e78d4203
define new constant of_real for class real_algebra_1;
huffman
parents:
20551
diff
changeset

376 
qed 
c433e78d4203
define new constant of_real for class real_algebra_1;
huffman
parents:
20551
diff
changeset

377 

20584
60b1d52a455d
added classes real_div_algebra and real_field; added lemmas
huffman
parents:
20560
diff
changeset

378 
instance real :: real_normed_field 
20554
c433e78d4203
define new constant of_real for class real_algebra_1;
huffman
parents:
20551
diff
changeset

379 
apply (intro_classes, unfold real_norm_def) 
c433e78d4203
define new constant of_real for class real_algebra_1;
huffman
parents:
20551
diff
changeset

380 
apply (rule abs_ge_zero) 
c433e78d4203
define new constant of_real for class real_algebra_1;
huffman
parents:
20551
diff
changeset

381 
apply (rule abs_eq_0) 
c433e78d4203
define new constant of_real for class real_algebra_1;
huffman
parents:
20551
diff
changeset

382 
apply (rule abs_triangle_ineq) 
c433e78d4203
define new constant of_real for class real_algebra_1;
huffman
parents:
20551
diff
changeset

383 
apply simp 
c433e78d4203
define new constant of_real for class real_algebra_1;
huffman
parents:
20551
diff
changeset

384 
apply (rule abs_mult) 
c433e78d4203
define new constant of_real for class real_algebra_1;
huffman
parents:
20551
diff
changeset

385 
done 
20504
6342e872e71d
formalization of vector spaces and algebras over the real numbers
huffman
parents:
diff
changeset

386 

20533  387 
lemma norm_zero [simp]: "norm (0::'a::real_normed_vector) = 0" 
20504
6342e872e71d
formalization of vector spaces and algebras over the real numbers
huffman
parents:
diff
changeset

388 
by simp 
6342e872e71d
formalization of vector spaces and algebras over the real numbers
huffman
parents:
diff
changeset

389 

6342e872e71d
formalization of vector spaces and algebras over the real numbers
huffman
parents:
diff
changeset

390 
lemma zero_less_norm_iff [simp]: 
20584
60b1d52a455d
added classes real_div_algebra and real_field; added lemmas
huffman
parents:
20560
diff
changeset

391 
fixes x :: "'a::real_normed_vector" 
60b1d52a455d
added classes real_div_algebra and real_field; added lemmas
huffman
parents:
20560
diff
changeset

392 
shows "(0 < norm x) = (x \<noteq> 0)" 
20504
6342e872e71d
formalization of vector spaces and algebras over the real numbers
huffman
parents:
diff
changeset

393 
by (simp add: order_less_le) 
6342e872e71d
formalization of vector spaces and algebras over the real numbers
huffman
parents:
diff
changeset

394 

6342e872e71d
formalization of vector spaces and algebras over the real numbers
huffman
parents:
diff
changeset

395 
lemma norm_minus_cancel [simp]: 
20584
60b1d52a455d
added classes real_div_algebra and real_field; added lemmas
huffman
parents:
20560
diff
changeset

396 
fixes x :: "'a::real_normed_vector" 
60b1d52a455d
added classes real_div_algebra and real_field; added lemmas
huffman
parents:
20560
diff
changeset

397 
shows "norm ( x) = norm x" 
20504
6342e872e71d
formalization of vector spaces and algebras over the real numbers
huffman
parents:
diff
changeset

398 
proof  
20533  399 
have "norm ( x) = norm ( 1 *# x)" 
20504
6342e872e71d
formalization of vector spaces and algebras over the real numbers
huffman
parents:
diff
changeset

400 
by (simp only: scaleR_minus_left scaleR_one) 
20533  401 
also have "\<dots> = \<bar> 1\<bar> * norm x" 
20504
6342e872e71d
formalization of vector spaces and algebras over the real numbers
huffman
parents:
diff
changeset

402 
by (rule norm_scaleR) 
6342e872e71d
formalization of vector spaces and algebras over the real numbers
huffman
parents:
diff
changeset

403 
finally show ?thesis by simp 
6342e872e71d
formalization of vector spaces and algebras over the real numbers
huffman
parents:
diff
changeset

404 
qed 
6342e872e71d
formalization of vector spaces and algebras over the real numbers
huffman
parents:
diff
changeset

405 

6342e872e71d
formalization of vector spaces and algebras over the real numbers
huffman
parents:
diff
changeset

406 
lemma norm_minus_commute: 
20584
60b1d52a455d
added classes real_div_algebra and real_field; added lemmas
huffman
parents:
20560
diff
changeset

407 
fixes a b :: "'a::real_normed_vector" 
60b1d52a455d
added classes real_div_algebra and real_field; added lemmas
huffman
parents:
20560
diff
changeset

408 
shows "norm (a  b) = norm (b  a)" 
20504
6342e872e71d
formalization of vector spaces and algebras over the real numbers
huffman
parents:
diff
changeset

409 
proof  
20533  410 
have "norm (a  b) = norm ( (a  b))" 
411 
by (simp only: norm_minus_cancel) 

412 
also have "\<dots> = norm (b  a)" by simp 

20504
6342e872e71d
formalization of vector spaces and algebras over the real numbers
huffman
parents:
diff
changeset

413 
finally show ?thesis . 
6342e872e71d
formalization of vector spaces and algebras over the real numbers
huffman
parents:
diff
changeset

414 
qed 
6342e872e71d
formalization of vector spaces and algebras over the real numbers
huffman
parents:
diff
changeset

415 

6342e872e71d
formalization of vector spaces and algebras over the real numbers
huffman
parents:
diff
changeset

416 
lemma norm_triangle_ineq2: 
20584
60b1d52a455d
added classes real_div_algebra and real_field; added lemmas
huffman
parents:
20560
diff
changeset

417 
fixes a b :: "'a::real_normed_vector" 
20533  418 
shows "norm a  norm b \<le> norm (a  b)" 
20504
6342e872e71d
formalization of vector spaces and algebras over the real numbers
huffman
parents:
diff
changeset

419 
proof  
20533  420 
have "norm (a  b + b) \<le> norm (a  b) + norm b" 
20504
6342e872e71d
formalization of vector spaces and algebras over the real numbers
huffman
parents:
diff
changeset

421 
by (rule norm_triangle_ineq) 
6342e872e71d
formalization of vector spaces and algebras over the real numbers
huffman
parents:
diff
changeset

422 
also have "(a  b + b) = a" 
6342e872e71d
formalization of vector spaces and algebras over the real numbers
huffman
parents:
diff
changeset

423 
by simp 
6342e872e71d
formalization of vector spaces and algebras over the real numbers
huffman
parents:
diff
changeset

424 
finally show ?thesis 
6342e872e71d
formalization of vector spaces and algebras over the real numbers
huffman
parents:
diff
changeset

425 
by (simp add: compare_rls) 
6342e872e71d
formalization of vector spaces and algebras over the real numbers
huffman
parents:
diff
changeset

426 
qed 
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changeset

427 

20584
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428 
lemma norm_triangle_ineq3: 
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429 
fixes a b :: "'a::real_normed_vector" 
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changeset

430 
shows "\<bar>norm a  norm b\<bar> \<le> norm (a  b)" 
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parents:
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changeset

431 
apply (subst abs_le_iff) 
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changeset

432 
apply auto 
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433 
apply (rule norm_triangle_ineq2) 
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diff
changeset

434 
apply (subst norm_minus_commute) 
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20560
diff
changeset

435 
apply (rule norm_triangle_ineq2) 
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diff
changeset

436 
done 
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diff
changeset

437 

20504
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438 
lemma norm_triangle_ineq4: 
20584
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changeset

439 
fixes a b :: "'a::real_normed_vector" 
20533  440 
shows "norm (a  b) \<le> norm a + norm b" 
20504
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441 
proof  
20533  442 
have "norm (a  b) = norm (a +  b)" 
20504
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443 
by (simp only: diff_minus) 
20533  444 
also have "\<dots> \<le> norm a + norm ( b)" 
20504
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445 
by (rule norm_triangle_ineq) 
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446 
finally show ?thesis 
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447 
by simp 
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formalization of vector spaces and algebras over the real numbers
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448 
qed 
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449 

20551  450 
lemma norm_diff_triangle_ineq: 
451 
fixes a b c d :: "'a::real_normed_vector" 

452 
shows "norm ((a + b)  (c + d)) \<le> norm (a  c) + norm (b  d)" 

453 
proof  

454 
have "norm ((a + b)  (c + d)) = norm ((a  c) + (b  d))" 

455 
by (simp add: diff_minus add_ac) 

456 
also have "\<dots> \<le> norm (a  c) + norm (b  d)" 

457 
by (rule norm_triangle_ineq) 

458 
finally show ?thesis . 

459 
qed 

460 

20560  461 
lemma norm_one [simp]: "norm (1::'a::real_normed_div_algebra) = 1" 
462 
proof  

463 
have "norm (of_real 1 :: 'a) = abs 1" 

464 
by (rule norm_of_real) 

465 
thus ?thesis by simp 

466 
qed 

467 

20504
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468 
lemma nonzero_norm_inverse: 
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changeset

469 
fixes a :: "'a::real_normed_div_algebra" 
20533  470 
shows "a \<noteq> 0 \<Longrightarrow> norm (inverse a) = inverse (norm a)" 
20504
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changeset

471 
apply (rule inverse_unique [symmetric]) 
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diff
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472 
apply (simp add: norm_mult [symmetric]) 
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473 
done 
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parents:
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changeset

474 

6342e872e71d
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475 
lemma norm_inverse: 
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476 
fixes a :: "'a::{real_normed_div_algebra,division_by_zero}" 
20533  477 
shows "norm (inverse a) = inverse (norm a)" 
20504
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parents:
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changeset

478 
apply (case_tac "a = 0", simp) 
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479 
apply (erule nonzero_norm_inverse) 
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480 
done 
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huffman
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changeset

481 

20584
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482 
lemma nonzero_norm_divide: 
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huffman
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diff
changeset

483 
fixes a b :: "'a::real_normed_field" 
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huffman
parents:
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diff
changeset

484 
shows "b \<noteq> 0 \<Longrightarrow> norm (a / b) = norm a / norm b" 
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huffman
parents:
20560
diff
changeset

485 
by (simp add: divide_inverse norm_mult nonzero_norm_inverse) 
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huffman
parents:
20560
diff
changeset

486 

60b1d52a455d
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huffman
parents:
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diff
changeset

487 
lemma norm_divide: 
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parents:
20560
diff
changeset

488 
fixes a b :: "'a::{real_normed_field,division_by_zero}" 
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added classes real_div_algebra and real_field; added lemmas
huffman
parents:
20560
diff
changeset

489 
shows "norm (a / b) = norm a / norm b" 
60b1d52a455d
added classes real_div_algebra and real_field; added lemmas
huffman
parents:
20560
diff
changeset

490 
by (simp add: divide_inverse norm_mult norm_inverse) 
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added classes real_div_algebra and real_field; added lemmas
huffman
parents:
20560
diff
changeset

491 

20684  492 
lemma norm_power: 
493 
fixes x :: "'a::{real_normed_div_algebra,recpower}" 

494 
shows "norm (x ^ n) = norm x ^ n" 

495 
by (induct n, simp, simp add: power_Suc norm_mult) 

496 

20504
6342e872e71d
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497 
end 