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math.CO2000
Symmetry Classes of Alternating Sign Matrices
David P. Robbins
An alternating sign matrix is a square matrix satisfying (i) all entries are equal to 1, -1 or 0; (ii) every row and column has sum 1; (iii) in every row and column the non-zero en…
math.CO2000
On the expected value of the minimum assignment
Marshall W. Buck, Clara S. Chan, David P. Robbins
The minimum k-assignment of an m by n matrix X is the minimum sum of k entries of X, no two of which belong to the same row or column. If X is generated by choosing each entry inde…