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doc-src/Tutorial/Ifexpr/valif
author nipkow
Wed, 15 May 2002 13:50:16 +0200
changeset 13153 4b052946b41c
parent 5377 efb799c5ed3c
permissions -rw-r--r--
arith can now deal with div 2 and mod 2.
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consts valif :: ifex => (nat => bool) => bool
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primrec
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"valif (CIF b)    env = b"
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"valif (VIF x)    env = env x"
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"valif (IF b t e) env = (if valif b env then valif t env
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                                        else valif e env)"
isabelle