Theorem: An $n \times n$ matrix $A$ is nonsingular iff $T(x) = Ax$ has an inverse transformation $T^{-1}$. The inverse transformation is given by $T^{-1}(y) = A^{-1}y$.
Like how this is organised?
Build your own knowledge tree on knowen.md: notes, decisions and tasks in one connected markdown graph, shared with your team and your AI agents.