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math.NA2026
Simultaneous Matrix-Free HSS Compression and Factorization with Adaptive Ranks
Elly Do, Chao Chen
Many dense matrices in scientific computing have hierarchically low-rank off-diagonal structure but are accessible only through routines that apply the matrix and, in general, its…
math.NA2026
Adaptive, Matrix-Free Low-Rank Approximation
Arnel I. Smith, Elly Do, Chao Chen
We study fixed-tolerance low-rank approximation in the matrix-free setting, where a matrix or linear operator is accessible only through matrix-vector products and its…