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2015 Oriented orbifold vertex groups and cobordism and an associated differential graded algebra
Kimberly Druschel
Algebr. Geom. Topol. 15(1): 169-190 (2015). DOI: 10.2140/agt.2015.15.169


We develop a homology of vertex groups as a tool for studying orbifolds and orbifold cobordism and its torsion. To a pair (G,H) of conjugacy classes of degree-n and degree-(n 1) finite subgroups of SO(n) and SO(n 1) we associate the parity with which H occurs up to O(n) conjugacy as a vertex group in the orbifold Sn1G. This extends to a map dn: βn βn1 between the Z2 vector spaces whose bases are all such conjugacy classes in SO(n) and then SO(n 1). Using orbifold graphs, we prove d: β β is a differential and defines a homology, . We develop a map s: β β+1 for a subcomplex of groups which admit orientation-reversing automorphisms. We then look at examples and algebraic properties of d and s, including that d is a derivation. We prove that the natural map ψ between the set of diffeomorphism classes of closed, locally oriented n–orbifolds and βn maps into kerdn and that this map is onto kerdn for n 4. We relate d to orbifold cobordism and surgery and show that ψ quotients to a map between oriented orbifold cobordism and .


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Kimberly Druschel. "Oriented orbifold vertex groups and cobordism and an associated differential graded algebra." Algebr. Geom. Topol. 15 (1) 169 - 190, 2015.


Received: 1 November 2013; Revised: 23 May 2014; Accepted: 21 July 2014; Published: 2015
First available in Project Euclid: 16 November 2017

zbMATH: 1321.57036
MathSciNet: MR3325735
Digital Object Identifier: 10.2140/agt.2015.15.169

Primary: 57R18, 57R90
Secondary: 55N32, 57R65

Rights: Copyright © 2015 Mathematical Sciences Publishers


Vol.15 • No. 1 • 2015
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