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(23 Feb 2013) Key: citeulike:12074970
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In this paper it is shown that an assortment of operads near to many topologists' hearts enjoy (homotopy) universal properties of an expressly combinatorial nature. These include the operads A_n and E_n. The main idea that makes this possible is the notion of an operator category, which controls the homotopy types of these operads in a strong sense.
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