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- Czech Technical University in PragueCZ4 papers
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math.SG2005
Ruled 4-manifolds and isotopies of symplectic surfaces
R. Hind, A. Ivrii
We study symplectic surfaces in ruled symplectic 4-manifolds which are disjoint from a given symplectic section. As a consequence we see that, in any symplectic 4-manifold, two hom…
math.SG2004
A deRham model for Chen-Ruan cohomology ring of abelian orbifolds
Bohui Chen, Shengda Hu
We present a deRham model for Chen-Ruan cohomology ring of abelian orbifolds. We introduce the notion of \emph{twist factors} so that formally the stringy cohomology ring can be de…