src/HOL/HOLCF/IOA/NTP/Packet.thy
author wenzelm
Mon, 11 Feb 2013 14:39:04 +0100
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child 62002 f1599e98c4d0
permissions -rw-r--r--
make WWW_Find work again, now that its ML modules reside within a theory context (cf. bf5b45870110) -- patch by Rafal Kolanski;
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(*  Title:      HOL/HOLCF/IOA/NTP/Packet.thy
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    Author:     Tobias Nipkow & Konrad Slind
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*)
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theory Packet
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imports Multiset
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begin
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type_synonym
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  'msg packet = "bool * 'msg"
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definition
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  hdr :: "'msg packet => bool" where
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  "hdr == fst"
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definition
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  msg :: "'msg packet => 'msg" where
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  "msg == snd"
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text {* Instantiation of a tautology? *}
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lemma eq_packet_imp_eq_hdr: "!x. x = packet --> hdr(x) = hdr(packet)"
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  by simp
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declare hdr_def [simp] msg_def [simp]
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end