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∑MathIntermediate

Kronecker Product & Vec Operator

The Kronecker product A ⊗ B expands a small matrix into a larger block matrix by multiplying every entry of A with the whole matrix B.

#kronecker product#vec operator#block matrix+12
∑MathIntermediate

Matrix Calculus Fundamentals

Matrix calculus extends single-variable derivatives to matrices so we can differentiate functions built from matrix multiplications, traces, and norms.

#matrix calculus
Advanced
Filtering by:
#frobenius norm
#frobenius norm
#trace trick
+12
∑MathIntermediate

Low-Rank Approximation

Low-rank approximation replaces a big matrix with one that has far fewer degrees of freedom while preserving most of its action.

#low-rank approximation#eckart-young theorem#svd+12
∑MathIntermediate

Matrix Norms & Condition Numbers

Matrix norms measure the size of a matrix in different but related ways, with Frobenius treating entries like a big vector, spectral measuring the strongest stretch, and nuclear summing all singular values.

#matrix norm#spectral norm#frobenius norm+12