2008 Second Semester MATHS课程问答帖(请用英文提问)

册那

maths250 assignment1 question 9.
Let n>=3. which of the following sets of vectors u = (x1,...,xn) in R^n are subspaces of R^n?
(a)all u such that x1>=0
give reasons to your answer.

cheers.

册那

how 2 prove that Null(A^T*A)=Null(A)? cheers.