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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. 单位矩阵和逆矩阵 - 知乎 - 知乎专栏

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

  6. 2.6: The Identity and Inverses - Mathematics LibreTexts

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

  8. The identity matrix and its properties - MathBootCamps

  9. Identity Matrix -- from Wolfram MathWorld

  10. Identity Matrix: Definition, Properties, and Applications - StudyPug