extensionality

Fetched 2026-10-26 (cache).

Synonyms: extensionalism, extensionally, intensionality

Antonyms: extensionalism, extensionally, intensionality

Related words from Datamuse; suggestions, not definitions.

Noun

1. {{lb|en|philosophy}} The principle that objects are equal if and only if their observed properties are the same, regardless of internal processes that lead to those properties.
2. {{lb|en|functional analysis}} The principle that [[function]]s are equal if and only if they operate on the same [[domain]] and for any given element of the domain the result of each of the functions is the same.
3. {{lb|en|set theory}} The principle, codified in the [[axiom of extensionality]], that sets are equal if and only if they contain the same elements.

Source: Wiktionary · CC BY-SA 4.0 (Wiktionary dump) · cached copy, not a rewrite.