Rel, bicategory of relations, allegory
left and right euclidean;
extensional, well-founded relations.
equality (definitional, propositional, computational, judgemental, extensional, intensional, decidable)
isomorphism, weak equivalence, homotopy equivalence, weak homotopy equivalence, equivalence in an (∞,1)-category
Examples.
basic constructions:
:
:
:
strong axioms
further
The denial inequality is the negation of equality.
This is a term found in constructive mathematics, to distinguish from other inequality relations such as apartness. It is taken for granted in classical mathematics.
If one wishes to reserve the word “inequality” for order relations (such as and ), then one may instead use the word disequality to refer to the denial inequality. (For instance, this is common in type theory with subtype relations that form an ordering on the types.)
Last revised on June 25, 2013 at 06:50:38. See the history of this page for a list of all contributions to it.