The Nullity reference article from the English Wikipedia on 24-Jul-2004 (provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

Nullity

In linear algebra, the nullity of a matrix M is the number of columns of M minus the rank of M. If the m by n matrix M is regarded as a linear transformation Rⁿ → R^m, then the nullity is equal to the dimension of the kernel of this linear transformation.

This is the "Nullity" reference article from the English Wikipedia. All text is available under the terms of the GNU Free Documentation License. See also our Disclaimer.