https://ocw.mit.edu/courses/18-06sc-linear-algebra-fall-2011/ Linear Algebra By - Prof. Gilbert Strang
begin: 2025.2.1 unit1: Ax=b and the Four Subspaces. About Matrix date: 2.1-2.7
unit2: Least Square, Determinants and Eigenvalues、Eigenvectors. date: 2.7-2.13
unit3: Poitive Dfinite Matrices and Applications date: 2.14-2.17
Final Review And Final Exam date: 2.18