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math.AT2018
Local Coefficients Revisited
Slawomir Kwasik, Fang Sun
Two simple "simplicial approximation" tricks are invoked to prove basic results involving (co)-homology with local coefficients.
math.AT2017★ 2 cited
An elementary proof for Poincare Duality with local coefficients
Fang Sun
An proof of Poincare Duality with local coefficients and with compact support is provided. The proof does not require Sheaf Theory or anything equivalent and is thus more accessibl…
math.AT2016
Topological Symmetries of R^3, II
Fang Sun
If a fintie group G acts topologically and faithfully on R^3, then G is a subgroup of O(3)
math.AT2016
Topological Symmetries of R^3
Slawomir Kwasik, Fang Sun
If a finite group acts topologically, faithfully and orientation preservingly on R^3, then it is isomorphic to a subgroup of SO(3).