Manual for mpz_powm, mpz_powm_ui

[Torbjörn Granlund]

abbott at dima.unige.it writes:

  What do mpz_powm and mpz_powm_ui return when the caller requests 0^0?

It is exponentiation in a ring, one should think of as quoting with the
last argument m, i.e., Z/mZ.  When m = 0 this is plain old Z.

Is that not what you observe?

  Are there restrictions on the value of the last arg (modulus)?
  [can modulus be 0, 1, negative?]
  
The sign of m does not affect the result.

-- 
Torbjörn
Please encrypt, key id 0xC8601622