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doc-src/Tutorial/Ifexpr/valif
author aspinall
Tue, 16 Nov 2004 20:20:14 +0100
changeset 15289 1d2dba93ef08
parent 5377 efb799c5ed3c
permissions -rw-r--r--
Markup obtain as introducing a nested goal.
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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