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@jemoka / Jemoka Knowledge Base / wiki/concepts/positive_semi_definite.md
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--- 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 \(z\).