euclidean distance matrices 1kronecker product 1nonnegative rank 1snt-rank 1symmetric nonnegative matrix factorization 1
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math.FA2026
Entrywise preservers of sign regularity
Projesh Nath Choudhury, Shivangi Yadav
Entrywise functions preserving positivity and related notions have a rich history, beginning with the seminal works of Schur, Pólya-SzegÅ, Schoenberg, and Rudin. Following their…
math.FA2026
Linear preserver problems in matrix positivity theory
Projesh Nath Choudhury, Shivangi Yadav
Linear preserver problems have been a central focus of research in matrix theory and operator theory for more than a century, beginning with Frobenius' 1897 characterization of det…
math.FA2025
Sign regularity preserving linear operators
Projesh Nath Choudhury, Shivangi Yadav
A matrix is strictly sign regular/SSR (or sign regular/SR) if for each , all (non-zero) minors of have the…