span{u,v} represents all the combinations of u and v. (at least that's what i understand).
and yes, span(u,2v) does contain v, and so can i multiply 2v by 1/2? and then have span{u,v} instead of span{u,2v}?
if this is the case, then how do i find the intersect if F=span{w,v} seeing as w is not...