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Matrix (mathematics) - Wikipedia
Matrices - Math is Fun
2.1: Introduction to Matrices - Mathematics LibreTexts
Matrices: Definition, Properties, Types, Formulas, and Examples
Khan Academy
Matrices | Brilliant Math & Science Wiki
7.5 Matrices and Matrix Operations - College Algebra 2e
Matrices - Mathematics LibreTexts
Fundamentals of Matrix Algebra - Open Textbook Library
Matrix -- from Wolfram MathWorld