
Help: bases and scalars
I am having a lot of trouble wrapping my head around these vector spaces...
How can I show that if {v1, v2, ... , vn} is a basis for a vector space V and c <> 0, then {cv1, v2, ... , vn} is also a basis for V?
Any help would be appreciated, thanks!

If you know about matrices, you can easily construct a inversible matrix that transforms your basis into your second set of vectors, and so conclude that it's also a basis.
But you can also show that each v_i , i=1,...,n , is a linear combination of {cv_1,...,v_n}, and then you've won because as {v_1,...v_n} is a basis, then your space has a dimension of n, so a subset with n vectors that spans your space is a basis.