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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.

Find a basis for the subspace of <5 spanned by S that is a subset of the vectors in S. To do this, we To do this, we set the columns of a matrix A as the vectors v 1 , v 2 , v 3 and v 4 :

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  Space, Columns, Basis, Column space, And nullspace, Nullspace

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