For any matrix $M \in \mathbb{R}^{n \times n}$, is it always possible to factorize it into $AYA^T$, with $Y$ being a circulant matrix? The dimension of $A$ and $Y$ are not constrained.
Thank you!
2026-04-04 04:33:23.1775277203
Factorization into Circulant Matrices
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