A Square matrix
is called reducible if the indices 1, 2, ...,
can be divided into two disjoint nonempty sets , , ..., and , , ..., (with
) such that
See also Square Matrix
References
Gradshteyn, I. S. and Ryzhik, I. M. Tables of Integrals, Series, and Products, 5th ed. San Diego, CA:
Academic Press, p. 1103, 1979.