Math Help - prove or disprove: statement about Span

1. prove or disprove: statement about Span

Hi.

is this true or false:

$Span\left \{ u \right \}=Span\left \{ u,v \right \}\cap Span\left \{ u,w \right \}$

$u\neq 0$

BTW,
i think it is true, but i'm not sure...

2. Re: prove or disprove: statement about Span

What if v = w?

3. Re: prove or disprove: statement about Span

didn't think about that.
thanks!