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  1. 2.1: Introduction to Matrices - Mathematics LibreTexts

  2. Matrices - Math is Fun

  3. Unit 20: Matrices - Khan Academy

  4. Intro to Matrices - YouTube

  5. Fundamentals of Matrix Algebra - Open Textbook Library

  6. Intro to matrices (video) | Matrices | Khan Academy

  7. 1: Introduction - Mathematics LibreTexts