Question

Determine which of the following subsets of R^(nxn) are in fact subspaces of R^(nxn)
c) The nonsingular matrices
d) The singular matrices
g) All matrices that commute with the given matrix A
i) All matrices such that trace(A)=0

Answer 1

if that level is blocking the R part for you too, it says ............... are in fact subspaces of R^(nxn)

Answer 2

I'm actually gonna have to think about this one xD H/o and see if I can think of anything.

Answer 3

Tell me if this link helps you any http://www.cliffsnotes.com/WileyCDA/CliffsReviewTopic/More-Vector-Spaces-Isomorphism.topicArticleId-20807,articleId-20795.html

Answer 4

not really.. sorry if this answer doesn't show up, I'm havin trouble with openstudy.. too much javascript on the page... and I don't believe that modern browsers proces java faster than they do html.. this site is soo slow on opera, ie and mozilla (all latest), anyway that link is not really helping since we didn't do isomorphisms or anything..