I understood how FFT works over complex field $\mathbb{C}$, but still do not understand why its variant Number Theoretic Transform (NTT) works over polynomial ring with some integer coefficient modulus as well.
Does anyone have some intuitions?
2026-02-22 19:28:26.1771788506
Why can FFT (NTT?) work well on polynomial ring with some integer coefficient modulus?
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