Non-formality of the odd dimensional framed little balls operads
arXiv:1609.06800 · doi:10.1093/imrn/rnx144
Abstract
We prove that the chain operad of the framed little balls (or disks) operad is not formal as a non-symmetric operad over the rationals if the dimension of their balls is odd and greater than 4.
10 pages, presentation improved, errors collected, references added