 Repeated-root cyclic code (source code)

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= Repeated-root cyclic code

A repeated-root cyclic code has length divisible by the characteristic of its field, so the polynomial $X^N-1$ has repeated factors. Its generator can involve powers of those factors. In characteristic two, length $2^t$ gives $X^{2^t}+1=(X+1)^{2^t}$.

// Target: algebra.bigb

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