Hi,
According to this function, Is there any function in sage that
element b {"b = f(x+a) - f(x)} on GF(p^n) (p is prime) must be into
G,
For example :
f(x) = x
G = GF(2^2,'a')
G.list() = {0,1,a,a+1}
then f(a) - f(a+1) = -1 !!!! must be one of {0,1,a,a+1}
Thx,
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