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doc-src/Tutorial/Recdef/ack
changeset 9255 2ceb11a2e190
parent 6100 40d66bc3e83f
equal deleted inserted replaced
9254:f8a0e8b9bcd8 9255:2ceb11a2e190 
     1 consts ack :: "nat*nat => nat"
 
     1 consts ack :: "nat*nat => nat"
 
     2 recdef ack "measure(%m. m) ** measure(%n. n)"
 
     2 recdef ack "measure(%m. m) <*lex*> measure(%n. n)"
 
     3   "ack(0,n)         = Suc n"
 
     3   "ack(0,n)         = Suc n"
 
     4   "ack(Suc m,0)     = ack(m, 1)"
 
     4   "ack(Suc m,0)     = ack(m, 1)"
 
     5   "ack(Suc m,Suc n) = ack(m,ack(Suc m,n))"
 
     5   "ack(Suc m,Suc n) = ack(m,ack(Suc m,n))"
isabelle