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doc-src/Tutorial/Ifexpr/bool2if
author paulson
Thu, 12 Oct 2000 12:15:59 +0200
changeset 10196 4d1af711cf7b
parent 5377 efb799c5ed3c
permissions -rw-r--r--
new I-rules r_into_rtrancl, r_into_trancl and a simpler proof

consts bool2if :: boolex => ifex
primrec
"bool2if (Const b) = CIF b"
"bool2if (Var x)   = VIF x"
"bool2if (Neg b)   = IF (bool2if b) (CIF False) (CIF True)"
"bool2if (And b c) = IF (bool2if b) (bool2if c) (CIF False)"
isabelle