nontrivial subcategory

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Category of rings — In mathematics, the category of rings, denoted by Ring, is the category whose objects are rings (with identity) and whose morphisms are ring homomorphisms (preserving the identity). Like many categories in mathematics, the category of rings is… … Wikipedia
Topos — For topoi in literary theory, see Literary topos. For topoi in rhetorical invention, see Inventio. In mathematics, a topos (plural topoi or toposes ) is a type of category that behaves like the category of sheaves of sets on a topological space.… … Wikipedia
Ergodic literature — is literature that requires a non trivial effort to traverse the text. This effort must be ; that is, it must consist of more than simply reading by moving one s eyes along lines of text, turning pages and mentally interpreting what one reads.… … Wikipedia

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