column and null space

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7 Terms

1
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null space/kernel of A mxn matrix/ker(A)

the set of vectors in Rn with Ax=0; dimension is called the nullity of A

2
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kernel and row space of A are

subspaces of Rn

3
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column space of A is

subspace of Rm

4
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row space of A/row(A)

= the span of the rows of A

5
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column space of A/image of A/col(A)

= the span of the columns of A, dimension is called the rank of A

6
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in terms of systems of equations, col(A) = im(A) =

the set of vectors y in Rm with y = Ax for some x in Rn

7
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in terms of systems of equations, null space = ker(A) is 

the set of solutions to homogenous system Ax = 0