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Fix Error
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TimmyChiang committed Sep 9, 2023
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2 changes: 1 addition & 1 deletion src/math/fast_fourier_transform.md
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Expand Up @@ -224,7 +224,7 @@ V_n^{-1} = \frac{1}{n}\left(
$$

> [ 補充說明 ] 驗證反矩陣的過程中會用到 \\( n \\) 次單位根的四個性質,若讀者有興趣可以自行鑽研:
> - 對於所有 \\( n, k \geq 0 \\), \\( d > 0 \\), \\( \omega_{dn}^{dk} = \omega_{n}^k \\).
> - 對於所有正偶數 \\( n \\), \\( \omega_{n}^{n/2} = \omega_{2} = -1 \\).
> - 對於所有正偶數 \\( n \\) 和非負整數 \\( k \\), 我們有 \\( (\omega_{n}^{k+n/2})^2 = (\omega_n^k)^2 \\).
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