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Identity Matrix ○꠹｜Definition｜1st｜20251119205401-00-⌔

Identity matrix - Wikipedia

Identity matrix

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In linear algebra, the identity matrix of size $n$ is the $n\times n$ square matrix with ones on the main diagonal and zeros elsewhere. It has unique properties; for example when the identity matrix represents a geometric transformation, the object remains unchanged by the transformation. In other contexts, it is analogous to multiplying by the number 1.

Printed 2026-06-28.

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