How can I prove that this matrix is a manifold?
$\begin{pmatrix} \cos(a) & -\sin(a) \\ \sin(a) & \cos(a) \end{pmatrix}$
Thanks!
2026-04-24 16:58:43.1777049923
How to prove 2x2 rotation matrix is a manifold
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Do you know what a manifold is? Does a matrix fit the description?