%0 Journal Article %T An upper bound on the sum of signs of permutations with a condition on their prefix sets %A Nikola Djokic %J Mathematics %D 2013 %I arXiv %X The following Proposition is a positive answer to a question about cancellations between permutations that arises in a model problem in the many body theory of Fermions. It concerns the mathematically rigorous implementation of the Pauli exclusion principle. %U http://arxiv.org/abs/1312.1185v1