2 papers
math.OC2026
Copositive Matrices with Ordered Off-Diagonal Entries
Grigoriy Blekherman, Santanu S. Dey, Alex Dunbar +1
We study copositive matrices which admit a decomposition into a sum of a positive semidefinite matrix and a matrix with nonnegative entries. Our main result shows that if the off-d…
math.AG2024
Pythagoras Numbers for Ternary Forms
Grigoriy Blekherman, Alex Dunbar, Rainer Sinn
We study the Pythagoras numbers of real ternary forms, defined for each degree as the minimal number such that every degree ternary form which is a sum of…