Totally positive matrix
Not to be confused with Positive matrix and Positive-definite matrix.
In mathematics, a totally positive matrix is a square matrix in which the determinant of every square submatrix, including the minors, is not negative.[1] A totally positive matrix also has all nonnegative eigenvalues.
Definition
Let
be an n × n matrix, where n, p, k, ℓ are all integers so that:
Then A is a totally positive matrix if:[2]
for all p. Each integer p corresponds to a p × p submatrix of A.
History
Topics which historically led to the development of the theory of total positivity include the study of:[2]
- the spectral properties of kernels and matrices which are totally positive,
- ordinary differential equations whose Green's function is totally positive (by M. G. Krein and some colleagues in the mid-1930s),
- the variation diminishing properties (started by I. J. Schoenberg in 1930),
- Pólya frequency functions (by I. J. Schoenberg in the late 1940s and early 1950s).
Examples
For example, a Vandermonde matrix whose nodes are positive and increasing is a totally positive matrix.
See also
References
- ↑ George M. Phillips (2003), "Total Positivity", Interpolation and Approximation by Polynomials, Springer, p. 274, ISBN 9780387002156
- 1 2 Spectral Properties of Totally Positive Kernels and Matrices, Allan Pinkus
Further reading
- Allan Pinkus (2009), Totally Positive Matrices, Cambridge University Press, ISBN 9780521194082
External links
- Spectral Properties of Totally Positive Kernels and Matrices, Allan Pinkus
- Parametrizations of Canonical Bases and Totally Positive Matrices, Arkady Berenstein
- Tensor Product Multiplicities, Canonical Bases And Totally Positive Varieties (2001), A. Berenstein , A. Zelevinsky
This article is issued from Wikipedia - version of the 10/31/2016. The text is available under the Creative Commons Attribution/Share Alike but additional terms may apply for the media files.