positroid

plural positroids

1. mathematicsA matroid of a real matrix with nonnegative maximal minors

   Finally, we give a way of producing a number for each matroid variety called its expected codimension that can be computed combinatorially solely from the matroid itself and show that it agrees with the actual codimension in the case of a positroid variety.

   2015, Nicolas Ford, “Geometric Shifts and Positroid Varieties”, in arXiv