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src/sectionCRS.xml
We could compute the column space of a matrix with a span of the set of columns of the matrix, much as we did back in <acroref type="sage" acro="CSS" /> when we were checking consistency of linear systems using spans of the set of columns of a coeffiicent matrix. However, Sage provides a convenient matrix method to construct this same span: <code>.column_space()</code>. Here is a check.
+We could compute the column space of a matrix with a span of the set of columns of the matrix, much as we did back in <acroref type="sage" acro="CSS" /> when we were checking consistency of linear systems using spans of the set of columns of a coefficent matrix. However, Sage provides a convenient matrix method to construct this same span: <code>.column_space()</code>. Here is a check.