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math.CT2015
An ordered framework for partial multivalued functors
Alveen Chand, Ittay Weiss
The category Rel of sets and relations intimately ties the notions of function, partial multivalued function, and direct image under a function through the description of Rel as th…
math.CT2014
A folk Quillen model structure for operads
Ittay Weiss
We establish, by elementary means, the existence of a cofibrantly generated monoidal model structure on the category of operads. By slicing over a suitable operad the classical Rez…