A graded category is a mathematical concept.
If is a category, then a -graded category is a category together with a functor .
Monoids and groups can be thought of as categories with a single element. A monoid-graded or group-graded category is therefore one in which to each morphism is attached an element of a given monoid (resp. group), its grade. This must be compatible with composition, in the sense that compositions have the product grade.
Famous quotes containing the words graded and/or category:
“I don’t want to be graded on a curve.”
—Mary Carillo (b. 1957)
“I see no reason for calling my work poetry except that there is no other category in which to put it.”
—Marianne Moore (1887–1972)