Home/Algebra/Matrices/Identity matrix16. MatricesIdentity matrixLevel: intermedioIn 16. MatricesFormulaCopy LaTeXAI=IA=AAI=IA=AAI=IA=ATagsalgebraalgebra formulalinearmatricesDetailIdentity element for matrix multiplication.Explore the ideaFound an error? Contact us.Related formulasRelatedInverse of a 2×2 matrixA−1=1ad−bc(d−b−ca)A^{-1}=\frac1{ad-bc}\begin{pmatrix}d&-b\\-c&a\end{pmatrix}A−1=ad−bc1(d−c−ba)Open formulaOpen in section