Shivangi Yadav

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2 papers · 1 filter

math.FA2025

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-Szegő, Schoenberg, and Rudin. Following their cl…

math.FA2024

Sign regularity preserving linear operators

Projesh Nath Choudhury, Shivangi Yadav

A matrix $A \in R^{m \times n}$ is strictly sign regular/SSR (or sign regular/SR) if for each $1 \leq k \leq min {m, n}$ , all (non-zero) $k \times k$ minors of $A$ have the…