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Apr 21, 2010 at 19:11 comment added Jeffrey Giansiracusa yes, one can write down cup products by choosing a simplicial approximation of the diagonal, but then for the full A-infinity structure one needs some choices of explicit homotopies and higher homotopies to make the diagonal coassociative. A brute force approach becomes pretty much impossible and I was wondering if someone might have managed to do something more clever.
Apr 21, 2010 at 17:31 history edited Ben Cooper CC BY-SA 2.5
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Apr 21, 2010 at 17:22 history answered Ben Cooper CC BY-SA 2.5