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math.CO2025
Bruhat operads II. Multiplicative structures
Gleb Koshevoy, Vadim Schechtman
The Bruhat operads from \cite{KS} are equipped with a structure of operads with multiplication.
math.CO2025
On universal quadratic inequalities for minors of TNN matrices
Vladimir I. Danilov, Alexander V. Karzanov, Gleb A. Koshevoy
For positive integers , we give a combinatorial characterization for the set of quadratic inequalities on minors that are valid for all totally nonnegative matri…
math.CO2025
Bruhat operads
Gleb Koshevoy, Vadim Schechtman, with Appendix by Daria Poliakova
We describe some planar operads built from the higher Bruhat orders and show that they admit a multiplication.