Algorithmic number theory
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In this contribution we show how to find y(x) in the polynomial equation y(x)p ≡ t(x) mod f(x), where t(x), y(x) and f(x) are polynomials over the field GF(pm). The solution of such equations are thought for in many cases, e.g., for p = 2 it is a step in the so-called Patterson Algorithm for decoding binary Goppa codes.