use totient function for mult. group size #10
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it is cleaner to use the Euler totient function to compute the size of the group. this works for any modulus, and so we can now perform the NTT for arbitrary rings Z/NZ as long as n divides the group size.
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it is cleaner to use the Euler totient function to compute the size of the group. this works for any modulus, and so we can now perform the NTT for arbitrary rings Z/NZ as long as n divides the group size.