category algebra

symmetric monoidal (∞,1)-category of spectra The space of functions on the space of morphisms of a small category (with coefficients in some ring ) naturally inherits a convolution algebra structure from the composition operation on morphisms. This is called its category convolution algebra or just category algebra for short. Often this is considered specifically for groupoids, and hence accordingly called a groupoid convolution algebra or just groupoid algebra for short. (For one-object...