The reduced row-echelon form of a matrix determines which subset of a spanning set is a basis.

Created almost 9 years ago, updated about 8 hours ago

Form $A=[v_1\ \cdots\ v_k]$ and find its pivot columns by row reduction. The corresponding original vectors form a basis of the span. Nonpivot columns are combinations of pivot columns. Do not substitute the reduced columns for the original generators.

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