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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
kernel and row space of A are
subspaces of Rn
column space of A is
subspace of Rm
row space of A/row(A)
= the span of the rows of A
column space of A/image of A/col(A)
= the span of the columns of A, dimension is called the rank of A
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
in terms of systems of equations, null space = ker(A) is
the set of solutions to homogenous system Ax = 0