How do you find the number of (and how to construct) invertible elements of the polynomial ring $F_2[X]/⟨X^n−1⟩$ for general $n$? I know the factorization of $X^n-1$ is useful but I'm not sure how to apply this here.
2026-03-29 02:45:38.1774752338
Number of Invertible Elements
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