UPPER BOUNDS FOR SUBPERMANENTS OF NONNEGATIVE MATRICES

@inproceedings{Cheon1995UPPERBF,
  title={UPPER BOUNDS FOR SUBPERMANENTS OF NONNEGATIVE MATRICES},
  author={Gi-Sang Cheon},
  year={1995}
}
For an $n \times n$ matrix $A = [a_{ij}]$, the permanent of A, per A, is defined by $$ per(A) = \sum_{\sigma}{a_{1 \simga(1)} \cdots a_{n \sigma(n)}}, $$ where $\sigma$ runs over all permutations of ${1,\cdots,n}. 

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