---
title: "positive semi-definite"
type: concept
related: [Positive Semi Definite, Eigenvalue]
source: https://www.jemoka.com/posts/kbhpositive_semi_definite/
confidence: high
status: active
---

a matrix is PSD if all eigenvalue are \(\geq 0\), also meaning \(z^{T}K z \geq 0\) for all \(z\).
