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Linear Algebra Example Problems - Matrix Null Space Basis and Dimension
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The null space of a matrix is the collection of all vectors such as Ax = 0. In this video we show how to to find a basis to describe this subspace.
Simply perform row operations on A to obtain a reduced echelon form of the matrix to identify the basic and free variables in the system. Then, write this solution as a linear combination of free variables times a vector. These vectors are the basis of the null space and the number of vectors is the dimension of the space.
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