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LinearAlgebraReviewandReference

Linear Algebra Review and ReferenceZico Kolter (updated by Chuong Do)September 30, 2015 Contents1 Basic Concepts and Basic Notation .. 22 matrix Vector-Vector Products .. matrix -Vector Products .. matrix - matrix Products .. 53 Operations and The Identity matrix and Diagonal Matrices .. The Transpose .. Symmetric Matrices .. The Trace .. Norms .. Linear Independence and Rank .. The Inverse .. Orthogonal Matrices .. Range and Nullspace of a matrix .. The Determinant .. Quadratic Forms and Positive Semidefinite Matrices.

2.3 Matrix-Matrix Products Armed with this knowledge, we can now look at four different (but, of course, equivalent) ways of viewing the matrix-matrix multiplication C = AB as defined at the beginning of this section. First, we can view matrix-matrix multiplication as a …

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