Basis is finite set of vectors that are linearly independant

1. Apr 28, 2009

squenshl

I know that the basis is finite set of vectors that are linearly independant and SPANS that set. But why is when you find the basis for the row space for example the answer is {[u1,u2,...,um}} and not span{[u1,u2,...,um}]. I got this wrong in a test. I don't see why eventhough the definition states that it spans that set.

2. Apr 28, 2009

Hurkyl

Staff Emeritus
Re: Basis

If {u1, u2, ..., um} spans the vector space V, then span{u1, u2, ..., um} = V, right? And V is obviously not a basis for V.

3. Apr 28, 2009

HallsofIvy

Re: Basis

A basis is a set of vectors. The span of a set of vectors is a vector space, not a basis.