| author | wenzelm |
| Wed, 07 Apr 1999 15:43:16 +0200 | |
| changeset 6411 | 07e95e4cfefe |
| parent 3120 | c58423c20740 |
| child 8354 | c02e3c131eca |
| permissions | -rw-r--r-- |
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(* Title: HOL/ex/Perm.thy |
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ID: $Id$ |
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Author: Lawrence C Paulson, Cambridge University Computer Laboratory |
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Copyright 1995 University of Cambridge |
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Permutations: example of an inductive definition |
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*) |
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Perm = List + |
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consts perm :: "('a list * 'a list) set"
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syntax "@perm" :: ['a list, 'a list] => bool ("_ <~~> _" [50,50] 50)
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translations |
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"x <~~> y" == "(x,y) : perm" |
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inductive perm |
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intrs |
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Nil "[] <~~> []" |
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swap "y#x#l <~~> x#y#l" |
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Cons "xs <~~> ys ==> z#xs <~~> z#ys" |
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trans "[| xs <~~> ys; ys <~~> zs |] ==> xs <~~> zs" |
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end |