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math.AT2015
Deciding almost freeness of an action is NP-hard
Manuel Amann
We encode a compact Lie group action on a compact manifold by the Sullivan model of its Borel construction. We then prove that deciding whether this action is almost free is NP-har…
math.AT2015★ 1 cited
A note on the Hilali conjecture
Manuel Amann
In this short note we observe that the Hilali conjecture holds for two-stage spaces, i.e. we argue that the dimension of the rational cohomology is at least as large as the dimensi…