Neha Patil (Editor)

Corank

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In mathematics, corank may refer to any of several related concepts, complementary to the concept of the rank of a mathematical object:

  • The corank of an m × n matrix is m r where r is the rank of the matrix. Equivalently, by the fundamental theorem of linear algebra, it is the dimension of the left nullspace of the matrix.
  • Generalizing matrices to linear transformations of vector spaces, the corank of a linear transformation is the dimension of the cokernel of the transformation, which is the quotient of the codomain by the image of the transformation.
  • For a matroid with n elements and matroid rank r , the corank or nullity of the matroid is n r . In the case of linear matroids this coincides with the matrix corank. In the case of graphic matroids the corank is also known as the circuit rank or cyclomatic number.
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    Corank Wikipedia


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