       # Re: problem with Coefficient

```vonessen@selway.umt.edu wrote:
>
> The Mathematica function Coefficient seemingly does not always work as
> it should:
>
> In:=Coefficient[x^2 y^2,x^2 y^2]
> Out=1
> In:=Coefficient[x1^2 x2^2,x1^2 x2^2] Out=0
>
> The first computation is correct, the second not.  I made this
> computation on several computers using Mathematica 3.0 under Windows
> 95.

No help, but some other input to the discussion:

returns
Coefficient[x^2  y^2,x^2  y^2]     			1 Coefficient[x1^2  y1^2,x1^2
y1^2]			1 Coefficient[x1^2  y2^2,x1^2  y2^2]			1 Coefficient[x1^2
x2^2,x1^2  x2^2]			0 Coefficient[(x1)^2 (x2)^2,Evaluate[(x1)^2
(x2)^2]]	0 Coefficient[x2^2  x3^2,x2^2  x3^2]			0 Coefficient[fred2^2
fred3^2,fred2^2  fred3^2]		0 Coefficient[polly2^2  fred3^2,polly2^2
fred3^2]	0 Coefficient[p^2  f^2,p^2  f^2]				1
Coefficient[Evaluate[x1^2  x2^2/.{x1->x,x2->y}],
Evaluate[x1^2  x2^2/.{x1->x,x2->y}]]			1

It seems like it cannot correctly handle similar symbols or long symbol
names and works best with single letters and no numbers.  This is a
strange limitation.  I wonder if this would pass technical supports
definition of a bug?  If it is not a bug, but a "feature", I would be
very interested to know the explanation.

```

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