16 citations · 69 across the 23 of their papers we have counts for
Showing 2019Show all
3 papers · 1 filter
math.CO2019★ 1 cited
Boundary measurement and sign variation in real projective space
John Machacek
We define two generalizations of the totally nonnegative Grassmannian and determine their topology in the case of real projective space. We find the spaces to be PL manifolds with…
math.CO2019★ 10 cited
New Invariants for Permutations, Orders and Graphs
Jean-christophe Aval, Nantel Bergeron, John Machacek
We study the symmetric function and polynomial combinatorial invariants of Hopf algebras of permutations, posets and graphs. We investigate their properties and the relations among…
math.CO2019★ 1 cited
Building maximal green sequences via component preserving mutations
Eric Bucher, John Machacek, Evan Runburg +2
We introduce a new method for producing both maximal green and reddening sequences of quivers. The method, called component preserving mutations, generalizes the notion of direct s…