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Re: Unwanted Recursion

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  • Subject: [mg120060] Re: Unwanted Recursion
  • From: David Bailey <dave at>
  • Date: Thu, 7 Jul 2011 07:31:28 -0400 (EDT)
  • References: <iv1a95$sjl$>

On 06/07/2011 10:35, Casorati wrote:
> I'm trying to define an anti-commutative algebra in Mathematica.
> Here I will show only a minimal example to demonstrate my point.
> The product of two elements a^b should be give by p[a,b] so I
> make p flat:
> SetAttributes[p, {Flat}]
> But now I want p[a] to reduce to a.
> Such a  rule would make other rules much simpler but when I define
> p[a_] := a
> the expression p[a] causes an infinite recursion. I get the message
> $IterationLimit::itlim: Iteration limit of 4096 exceeded.
> I have similar problems with p[]:=1 which makes mathematica puts
> ones into the p : p[a]=p[a,a]=p[1,1,...,a] .
> How can I solve this problem?

I see no infinite recursion:

In[649]:= p[a_]:=a;

In[650]:= p[a]

Out[650]= a

I suggest you post a specific piece of code that reproduces this problem 
immediately after killing the kernel.

I also wonder what the real purpose of p is.

David Bailey

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