(logic) A relation between two structures which have the property that every first-order formula is valid in one structure if and only if it is valid in the other.

(mathematics) Exhibiting Morita equivalence.

(mathematics) A certain relationship defined between algebraic rings that preserves many ring-theoretic properties.

plural of elementary equivalence

plural of equivalent variation

plural of equivalence gate

plural of equivalence principle

A relationship that considers two elements equivalent if one can be obtained from the other by a sequence of transformations of the form yzx -> yxz whenever x zxy whenever x ≤ y < z.

(category theory) An adjunction whose unit and counit are both natural isomorphisms.

(finance) The guaranteed amount of money that an investor regards as equally desirable as a risky asset.