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∑MathIntermediate

Hessian Matrix

The Hessian matrix collects all second-order partial derivatives of a scalar function and measures local curvature.

#hessian matrix#second derivatives#curvature+11
∑MathIntermediate

Positive Definite Matrices

A real symmetric matrix A is positive definite if and only if x^T A x > 0 for every nonzero vector x, and positive semidefinite if x^T A x ≥ 0.

#positive definite
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#positive definite
#positive semidefinite
#cholesky decomposition
+11
📚TheoryIntermediate

Eigenvalue Decomposition

Eigenvalue decomposition rewrites a square matrix as a change of basis that reveals how it stretches and rotates space.

#eigenvalue decomposition#spectral theorem#power iteration+12