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[Bug-apl] recursive functions - ackerman

From: Fausto Saporito
Subject: [Bug-apl] recursive functions - ackerman
Date: Wed, 15 Apr 2015 21:03:27 +0200
Hello all,

I'm trying to implement ackerman function, but I got no luck ... and I cannot understand why this code doesn't work:

z←m ack n
→(m=0)/∆1
→(n=0)/∆2
z←(m-1) ack (m ack (n-1))
∆1: z←n+1 ⋄ →0
∆2: z←(m-1) ack 1

is the double recursion permitted in APL2 ?

thanks,
fausto

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