Suppose that we have $m\in N_+$ symmetrical real matrix $A_i,i=1,2...m,A_i\in R^{n\times n}$. Can we find an orthogonal matrix $T\in R^{n\times n}, TT'=T'T=I$ such that all of $B_i=T'A_iT$ are sparse matrices? In this problem setting, $m\ll n$ and sparsity means the number of non-zeros elements in a $n\times n$ matrix are $o(n^2)$.
2026-03-26 12:51:23.1774529483
Simultaneously sparsifying symmetrical real matrices
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