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doc-src/Tutorial/Recdef/ack
author wenzelm
Thu, 30 Mar 2000 14:28:54 +0200
changeset 8617 33e2bd53aec3
parent 6100 40d66bc3e83f
child 9255 2ceb11a2e190
permissions -rw-r--r--
support Hindley-Milner polymorphisms in binds and facts; let_bind(_i): polymorphic version; moved find_free, export_wrt to Isar/proof_context.ML;
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consts ack :: "nat*nat => nat"
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recdef ack "measure(%m. m) ** 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