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math.RA2026
Extended generalized permutahedra, and cointeracting bialgebras
Gunnar Fløystad, Dominique Manchon
A Hopf monoid structure on extended generalized permutahedra (EGP) was recently introduced by M.Aguiar and F.Ardila. We investigate the existence of a cointeracting bialgebra struc…
math.CO2026
The five-sequence of adjoints for combinatorial simplicial complexes
Gunnar Fløystad
For a set let be the poset of simplicial complexes whose vertices are in . For a function there are functors $ f^{! !}, f^{**}, f^{i…