Abstract
Let m and n be positive integers, and let R = (r1, . . . , rm) and S = (s1, . . . , sn) be nonnegative integral vectors. Let A(R,S) be the set of all m × n (0, 1)-matrices with row sum vector R and column vector S. Let R and S be nonincreasing, and let F(R) be the m × n (0, 1)-matrix, where for each i, the ith row of F(R,S) consists of ri 1’s followed by (n−ri) 0’s. Let A ∈ A(R,S). The discrepancy of A, disc(A), is the number of positions in which F(R) has a 1 and A has a 0. In this paper we investigate linear operators mapping m × n matrices over the binary Boolean semiring to itself that preserve sets related to the discrepancy. In particular, we show that bijective linear preservers of Ferrers matrices are either the identity mapping or, when m = n, the transpose mapping.
Similar content being viewed by others
References
L. B. Beasley, N. J. Pullman: Linear operators preserving properties of graphs. Proc. 20th Southeast Conf. on Combinatorics, Graph Theory, and Computing. Congressus Numerantium 70, Utilitas Mathematica Publishing, Winnipeg, 1990, pp. 105–112.
A. Berger: The isomorphic version of Brualdies nestedness is in P, 2017, 7 pages. Available at https://arxiv.org/abs/1602.02536v2.
A. Berger, B. Schreck: The isomorphic version of Brualdi’s and Sanderson’s nestedness. Algorithms (Basel) 10 (2017), Paper No. 74, 12 pages.
R. A. Brualdi, G. J. Sanderson: Nested species subsets, gaps, and discrepancy. Oecologia 119 (1999), 256–264.
R. A. Brualdi, J. Shen: Discrepancy of matrices of zeros and ones. Electron. J. Comb. 6 (1999), Research Paper 15, 12 pages.
S. M. Motlaghian, A. Armandnejad, F. J. Hall: Linear preservers of row-dense matrices. Czech. Math. J. 66 (2016), 847–858.
Acknowledgements
The author wishes to thank the referee whose many suggestions improved the presentation.
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Beasley, L.B. (0, 1)-Matrices, Discrepancy and Preservers. Czech Math J 69, 1123–1131 (2019). https://doi.org/10.21136/CMJ.2019.0092-18
Received:
Published:
Issue Date:
DOI: https://doi.org/10.21136/CMJ.2019.0092-18