Prove that for a px q matrix B, the column space of B is a subspace of RP. (This needs to be a formal proof.)

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
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Prove that for a px q matrix B, the column space of B is a subspace of RP. (This needs to
be a formal proof.)
Transcribed Image Text:Prove that for a px q matrix B, the column space of B is a subspace of RP. (This needs to be a formal proof.)
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Step 1

The column space (also called the range or image) of a matrix  B  is the span (set of all possible linear combinations) of its column vectors. The column space of a matrix is the image or range of the corresponding matrix transformation. 

B is a p×q matrix. B can be considered as a linear transformation from R^q  to  R^p. 

i.e.  it takes the vectors of  R^q to the vectors of R^p. So, column space of B is a subset of R^p.

Let  b1, b2  is in Col(B)  and  c1, c2 be scalars. We have to show,  c1.b1+c2.b2 is in Col(B). 

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