--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/src/Sequents/LK.thy Wed Oct 09 13:32:33 1996 +0200
@@ -0,0 +1,84 @@
+(* Title: LK/lk.thy
+ ID: $Id$
+ Author: Lawrence C Paulson, Cambridge University Computer Laboratory
+ Copyright 1993 University of Cambridge
+
+Classical First-Order Sequent Calculus
+
+There may be printing problems if a seqent is in expanded normal form
+ (eta-expanded, beta-contracted)
+*)
+
+LK = Sequents +
+
+
+consts
+
+ Trueprop :: "two_seqi"
+ "@Trueprop" :: "two_seqe" ("((_)/ |- (_))" [6,6] 5)
+
+
+ True,False :: o
+ "=" :: ['a,'a] => o (infixl 50)
+ Not :: o => o ("~ _" [40] 40)
+ "&" :: [o,o] => o (infixr 35)
+ "|" :: [o,o] => o (infixr 30)
+ "-->","<->" :: [o,o] => o (infixr 25)
+ The :: ('a => o) => 'a (binder "THE " 10)
+ All :: ('a => o) => o (binder "ALL " 10)
+ Ex :: ('a => o) => o (binder "EX " 10)
+
+rules
+ (*Structural rules*)
+
+ basic "$H, P, $G |- $E, P, $F"
+
+ thinR "$H |- $E, $F ==> $H |- $E, P, $F"
+ thinL "$H, $G |- $E ==> $H, P, $G |- $E"
+
+ cut "[| $H |- $E, P; $H, P |- $E |] ==> $H |- $E"
+
+ (*Propositional rules*)
+
+ conjR "[| $H|- $E, P, $F; $H|- $E, Q, $F |] ==> $H|- $E, P&Q, $F"
+ conjL "$H, P, Q, $G |- $E ==> $H, P & Q, $G |- $E"
+
+ disjR "$H |- $E, P, Q, $F ==> $H |- $E, P|Q, $F"
+ disjL "[| $H, P, $G |- $E; $H, Q, $G |- $E |] ==> $H, P|Q, $G |- $E"
+
+ impR "$H, P |- $E, Q, $F ==> $H |- $E, P-->Q, $F"
+ impL "[| $H,$G |- $E,P; $H, Q, $G |- $E |] ==> $H, P-->Q, $G |- $E"
+
+ notR "$H, P |- $E, $F ==> $H |- $E, ~P, $F"
+ notL "$H, $G |- $E, P ==> $H, ~P, $G |- $E"
+
+ FalseL "$H, False, $G |- $E"
+
+ True_def "True == False-->False"
+ iff_def "P<->Q == (P-->Q) & (Q-->P)"
+
+ (*Quantifiers*)
+
+ allR "(!!x.$H |- $E, P(x), $F) ==> $H |- $E, ALL x.P(x), $F"
+ allL "$H, P(x), $G, ALL x.P(x) |- $E ==> $H, ALL x.P(x), $G |- $E"
+
+ exR "$H |- $E, P(x), $F, EX x.P(x) ==> $H |- $E, EX x.P(x), $F"
+ exL "(!!x.$H, P(x), $G |- $E) ==> $H, EX x.P(x), $G |- $E"
+
+ (*Equality*)
+
+ refl "$H |- $E, a=a, $F"
+ sym "$H |- $E, a=b, $F ==> $H |- $E, b=a, $F"
+ trans "[| $H|- $E, a=b, $F; $H|- $E, b=c, $F |] ==> $H|- $E, a=c, $F"
+
+
+ (*Descriptions*)
+
+ The "[| $H |- $E, P(a), $F; !!x.$H, P(x) |- $E, x=a, $F |] ==>
+ $H |- $E, P(THE x.P(x)), $F"
+end
+
+ ML
+
+val parse_translation = [("@Trueprop",Sequents.two_seq_tr "Trueprop")];
+val print_translation = [("Trueprop",Sequents.two_seq_tr' "@Trueprop")];