Assertion: column's base | /r/HasProperty | chosen for a matrix a
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Source sentences:
text: For a matrix A to describe a linear map f: V→W, bases for both spaces must have been chosen; recall that by definition this means that every vector in the space can be written uniquely as a (finite) linear combination of basis vectors, so that written as a (column) vector v of coefficients, only finitely many entries v i are nonzero.