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doc-src/Tutorial/Misc/Fib.thy
author wenzelm
Thu, 04 Oct 2001 15:20:40 +0200
changeset 11670 59f79df42d1f
parent 5377 efb799c5ed3c
permissions -rw-r--r--
proof by cases and induction on types and sets (used to be specific for HOL);
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Fib = WF_Rel +
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consts fib  :: nat => nat
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recdef fib "measure(%n. n)"
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    "fib 0 = 0"
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    "fib 1 = 1"
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    "fib (Suc(Suc x)) = fib x + fib (Suc x)"
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end
isabelle