Students work together with a faculty member on scholarly or artistic pro In Abstract Algebra 1 you have encountered groups and rings, but what happens when algebraic structures interact with each other? With Russ Woodroofe, I have been studying the intersection posets of subspace arrangements arising from graphs of group actions. For the regular action of a supersolvable group, we know that the poset is shallable. We conjecture that this is true for all permutation actions. If not, what additional conditions on the group are needed? What about any action of a supersolvable group? Students would start learning about group actions, posets, and shellings and then try to study small groups and actions and try to find an explicit shelling of the subspace action arrangement poset. In GAP (a Computer Algebra System) we have some rudimentary code that can generate the posets, but this would need to be improved if one hopes to use the pictures that are generated to be useful for a labelling. One way to approach this is to induce a labelling of the vertices from the coset poset (i.e., the poset for the regular action) and use it to build a shelling on the subposet.
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