Incidence coalgebras of interval finite posets of tame comodule type
Zbigniew Leszczyński, Daniel Simson · Colloquium Mathematicum · 2015
The incidence coalgebras $ K^{\Box} I$ of interval finite posets $I$ and their comodules are studied by means of the reduced Euler integral quadratic form $q^\bullet :\mathbb Z^{(I)}\to \mathbb Z$, where $K$ is an algebraically closed field. It is shown