[理工] 線代 - system equation
Q. Which of the following statement is true?
(A) Every matrix is row equivalent to a unique matrix in echelon form.
(B) Any system of n linear equations in n variables has at most n solutions.
(C) If a system of linear equations has two different solutions, it must have
infinitely many solutions.
(D) If a system of linear equations has no free variables, then it has a
unique solution.
(E) If A is an m x n matrix and the equation Ax = b is consistent for some b,
then the columns of A span Rm.
(A) False, echelon form 不唯一,reduced row-echelon才會唯一
(B) False, 可能「有解(唯一/無限)、無解」
(C) False, 有可能是「唯一解、零解Trival solution」
(D) True
(E) False, 對某些b才有解,代表Range(A)不能涵蓋整個對應域Rm
這是我的想法,但是我不確定(A)和(D),想問一下大家的想法,謝謝。
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