This is probably very complicated, but is there a quick method to see whether the outer automorphism group of the incidence algebra of a finite connected poset over the rationals is finite using SAGE?
We can assume that the poset is additionally such that the underlying graph of the Hasse quiver is not a tree and such that there is no element x in the poset that is comparable to all other elements (see https://ask.sagemath.org/question/54438/filtering-certain-posets/ ), since in those cases the outer automorphism group is indeed finite.
Im interested in infinite outer automorphism groups to construct some exotic examples, but such posets seem to be rather rare.
