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conditional limits


I have a function of two variables, f[x, y], which when evaluated for values of
x=y results in:
                                               1
              Power::infy: Infinite expression -- encountered.
                                               0.              

As there is an (x-y) term in the denominator of the function.  However,
the Limit[f[x,y], x-y] does exist, and evaluates to a finite number.


The question is, how do I construct a rule that conditionally evaluates
the limit of f[x,y] rather than f[x,y] whenever x=y?

Regards
Gary Kenward
Motorola Wireless Data Group





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