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doc-src/Tutorial/Ifexpr/value
author paulson
Mon, 02 Feb 2004 12:23:46 +0100
changeset 14371 c78c7da09519
parent 5377 efb799c5ed3c
permissions -rw-r--r--
Conversion of HyperNat to Isar format and its declaration as a semiring

consts value :: boolex => (nat => bool) => bool
primrec
"value (Const b) env = b"
"value (Var x)   env = env x"
"value (Neg b)   env = (~ value b env)"
"value (And b c) env = (value b env & value c env)"
isabelle