Math — Matrices & Determinants
2×2 determinant, transpose of a product, inverse and identity.
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\det\begin{pmatrix} a & b \\ c & d \end{pmatrix} = ad - bc
(AB)^\top = B^\top A^\top
A^{-1} = \frac{1}{\det A}\,\text{adj}(A)
AA^{-1} = A^{-1}A = I