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doc-src/Tutorial/Recdef/ack
author nipkow
Sat, 08 Jul 2000 19:14:43 +0200
changeset 9282 0181ac100520
parent 9255 2ceb11a2e190
permissions -rw-r--r--
Defs are now checked for circularity (if not overloaded).
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consts ack :: "nat*nat => nat"
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recdef ack "measure(%m. m) <*lex*> measure(%n. n)"
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  "ack(0,n)         = Suc n"
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  "ack(Suc m,0)     = ack(m, 1)"
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  "ack(Suc m,Suc n) = ack(m,ack(Suc m,n))"
isabelle