List questions from copositivity | MathQA

Whether the set of a symmetric copositive matrices $x^T A x \geq 0$ for $\forall x \in \mathbb{R}^n$ $x \geq 0$ is convex?

Published on 16 Apr 2026 - 17:41

Lagrange multiplier for more than one constraints.

Published on 14 Apr 2026 - 6:48

On copositive matrix criteria

Published on 14 Apr 2026 - 2:01

Example of a matrix which is copositive plus but not PSD.

Published on 15 Apr 2026 - 6:08

"Positive definite" matrix for component-wise positive vector

Published on 13 Apr 2026 - 19:57

Does the cone of copositive matrices include the cone of positive semidefinite matrices?

Published on 17 Apr 2026 - 2:44

Finding dual cone for a set of copositive matrices

Published on 15 Apr 2026 - 9:22

Example of copositive matrix but neither positive semidefinite nor elementwise nonnegative?

Published on 13 Apr 2026 - 8:02