| author | wenzelm |
| Sat, 20 Oct 2001 20:20:41 +0200 | |
| changeset 11852 | a528a716a312 |
| parent 11316 | b4e71bd751e4 |
| permissions | -rw-r--r-- |
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(* Title: ZF/ex/Primrec |
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ID: $Id$ |
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Author: Lawrence C Paulson, Cambridge University Computer Laboratory |
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Copyright 1994 University of Cambridge |
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Primitive Recursive Functions: preliminary definitions |
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*) |
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(*Theory TF redeclares map_type*) |
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val map_type = thm "List.map_type"; |
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(** Useful special cases of evaluation ***) |
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Goalw [SC_def] "[| x \\<in> nat; l \\<in> list(nat) |] ==> SC ` (Cons(x,l)) = succ(x)"; |
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by (Asm_simp_tac 1); |
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qed "SC"; |
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Goalw [CONST_def] "[| l \\<in> list(nat) |] ==> CONST(k) ` l = k"; |
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by (Asm_simp_tac 1); |
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qed "CONST"; |
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Goalw [PROJ_def] "[| x \\<in> nat; l \\<in> list(nat) |] ==> PROJ(0) ` (Cons(x,l)) = x"; |
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by (Asm_simp_tac 1); |
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qed "PROJ_0"; |
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Goalw [COMP_def] "[| l \\<in> list(nat) |] ==> COMP(g,[f]) ` l = g` [f`l]"; |
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by (Asm_simp_tac 1); |
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qed "COMP_1"; |
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Goalw [PREC_def] "l \\<in> list(nat) ==> PREC(f,g) ` (Cons(0,l)) = f`l"; |
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by (Asm_simp_tac 1); |
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qed "PREC_0"; |
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Goalw [PREC_def] |
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"[| x \\<in> nat; l \\<in> list(nat) |] ==> \ |
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\ PREC(f,g) ` (Cons(succ(x),l)) = \ |
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\ g ` Cons(PREC(f,g)`(Cons(x,l)), Cons(x,l))"; |
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by (Asm_simp_tac 1); |
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qed "PREC_succ"; |
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