Non-realizability of a triple Massey product for the algebra F2[a,b,c]/(ab,bc)
Abstract
We show that an often used example of a cohomology algebra with non-vanishing triple Massey product is intrinsically A3-formal and therefore, in fact, cannot be realized as the cohomology of a differential graded algebra with non-vanishing triple Massey product. We prove this result by computing the graded Hochschild cohomology group which contains the potential obstruction to the vanishing.
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