10.3 Polynomials on small finite fields

A multivariate polynomial over small finite field set by setmod_ff(p,n) can be factorized by using a builtin function sffctr(). modfctr() also factorizes a polynomial over a finite prime field. Internally, modfctr() creates a sufficiently large field extension of the specified ground field, and it calls sffctr(), then it constructs irreducible factors over the ground field from the factors returned by sffctr().

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