Row Space, Column Space, and Nullspace
row space , Column space , and NullspaceLinear AlgebraMATH 2010 Terminology:LetAbe the 2x4 matrixA=[2 3 1 04 5 6 2]Therow vectors ofAare[2 3 1 0][4 5 6 2](the rows ofA) in< vectors ofAare[24],[35],[ 16],[02](the columns ofA) in<2 Definition:LetAbe amxnmatrix (recallmis the number of rows andnis the number of columns ),then Therow spaceofAis the subspace of<nspanned by the row vectors ofA Thecolumn spaceofAis the subspace of<mspanned by the Column vectors ofA. Theorem:If amxnmatrixAis row-equivalent to amxnmatrixB, then the row space ofAis equalto the row space ofB. (NOT true for the Column space ) Theorem:If a matrixAis row-equivalent to a matrixBin row- echelon form, then the nonzero rowvectors ofBform a basis for the row space ofA.
† Theorem: If a matrix A is row-equivalent to a matrix B in row-echelon form, then the nonzero row ... The columns from the original matrix which have leading ones when reduced form a basis for the column space of A. In the above example, columns 1, …
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