Isomorphism theorems | Theorems in linear algebra

Fundamental theorem of linear algebra

In mathematics, the fundamental theorem of linear algebra is a collection of statements regarding vector spaces and linear algebra, popularized by Gilbert Strang. The naming of these results is not universally accepted. More precisely, let f be a linear map between two finite-dimensional vector spaces, represented by a m×n matrix M of rank r, then: * r is the dimension of the column space of M, which represents the image of f; * n – r is the dimension of the null space of M, which represents the kernel of f; * m – r is the dimension of the cokernel of f. The transpose MT of M is the matrix of the dual f* of f. It follows that one has also: * r is the dimension of the row space of M, which represents the image of f*; * m – r is the dimension of the left null space of M, which represents the kernel of f*; * n – r is the dimension of the cokernel of f*. The two first assertions are also called the rank–nullity theorem. (Wikipedia).

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From playlist Modern Algebra

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Related pages

Rank–nullity theorem | Linear map | Transpose | Cokernel | Linear algebra | Vector space | Kernel (linear algebra) | Matrix (mathematics) | Rank (linear algebra) | Image (mathematics)