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AbstractLet P be an n-gon with n≥3{n\geq 3}. There is a formal combinatorial A∞{A_{\infty}}-coalgebra structure on cellular chains C*(P){C_{*}(P)}with non-vanishing higher order structure when n≥5{n\geq 5}.If Xg{X_{g}}is a closed compact surface of genus g≥2{g\geq 2}and Pg{P_{g}}is a polygonal decomposition, the quotient map q:Pg→Xg{q\colon P_{g}\to X_{g}}projects the formal A∞{A_{\infty}}-coalgebra structure on C*(Pg){C_{*}(P_{g})}to a quotient structure on C*(Xg){C_{*}(X_{g})}, which persists to homology H∗(Xg;ℤ2){H_{\ast}(X_{g};\mathbb{Z}_{2})}, whose operations are determined by the quotient map q, and whose higher order structure is non-trivial if and only if Xg{X_{g}}is orientable with g≥2{g\geq 2}or unorientable with g≥3{g\geq 3}.But whether or not the A∞{A_{\infty}}-coalgebra structure on homology observed here is topologically invariant is an open question.
Georgian Mathematical Journal – de Gruyter
Published: Dec 1, 2018
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