Abstract
We classify all idempotent comultiplications on a graded anticommutative algebra up to degree 3, provided its components are torsion free, and topologically realize all algebraic possibilities. Then we extend some results to dimension n and obtain topological consequences about closed n-manifolds with cohomology of special type.
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Cavicchioli, A., Meschiari, M. Idempotent comultiplications on graded algebras. Geom Dedicata 41, 251–274 (1992). https://doi.org/10.1007/BF00147455
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DOI: https://doi.org/10.1007/BF00147455