摘要： Chater 1 Matrices and Gaussian EliminationAx=b can be seen by two pictures, Row picture: Intersection of planes, Column picture: Combination of columns.If the n planes have no point in common, or infinitely many points, then the n columns lie in the same plane.这句话是说，n个方程，n个未知数，从行的角度说是相当于是n个n-1维平面，当一 阅读全文