Recent content by xihashiwo

  1. X

    Graduate Hello,I have a question. If A and B are NND matrices, how to prove

    Please no worry about those stuff, I am just confused about my original question, why C(A) belongs to C(A+B), is there any tricks?
  2. X

    Graduate Hello,I have a question. If A and B are NND matrices, how to prove

    NND is nonnegative definite, C is column space
  3. X

    Graduate Hello,I have a question. If A and B are NND matrices, how to prove

    Hello, I have a question. If A and B are NND matrices, how to prove C(A) belongs to C(A+B)? I can prove that C(A)<C(A,B) by using A=(A,B)transpose[(I,0)], and I also can prove C(A+B)<C(A,B) using the similar approach. But I cannot move further because my thoughs maybe not related to the...