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Groups > comp.soft-sys.math.mathematica > #3542

Re: Unwanted Recursion

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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
http://www.dbaileyconsultancy.co.uk

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Unwanted Recursion Casorati <casorati@f-m.fm> - 2011-07-06 09:35 +0000
  Re: Unwanted Recursion Kambis Veschgini <k.veschgini@thphys.uni-heidelberg.de> - 2011-07-07 11:29 +0000
  Re: Unwanted Recursion David Bailey <dave@removedbailey.co.uk> - 2011-07-07 11:39 +0000
    Re: Unwanted Recursion Kambis Veschgini <k.veschgini@thphys.uni-heidelberg.de> - 2011-07-08 09:01 +0000
    Re: Unwanted Recursion David Bailey <dave@removedbailey.co.uk> - 2011-07-08 09:01 +0000

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