1/0^a vs 0^(-a)

I would think that 0^(-a) and 1/0^a behave the same, but they don't:

  (%i2) 0^a;
  (%o2) 0

  (%i3) 0^(-a);
  (%o3) 0

  (%i4) 1/0^a;
  expt: undefined: 0 to a negative exponent.

--bw



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