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  1. Identity matrix - Wikipedia

  2. 介绍identity matrices - CSDN博客

  3. Identity Matrix (Unit matrix) - Definition, Properties and Examples

  4. Identity Matrix (Unit Matrix) - Definition, Properties & Examples

  5. Identity Matrix - What is Identity Matrix? Examples - Cuemath

  6. 2.6: The Identity and Inverses - Mathematics LibreTexts

  7. Identity Matrix -- from Wolfram MathWorld

  8. The identity matrix and its properties - MathBootCamps

  9. Identity matrix: intro to identity matrices (article) | Khan Academy

  10. Identity matrix - Statlect