preimage
Definition from Wiktionary, the free dictionary
Contents
English[edit]
Etymology[edit]
Pronunciation[edit]
 Rhymes: ɪmɪdʒ
Noun[edit]
preimage (plural preimages)
 (mathematics) The set containing exactly every member of the domain of a function such that the member is mapped by the function onto an element of a given subset of the codomain of the function. Formally, of a subset B of the codomain Y under a function ƒ, the subset of the domain X defined by
 For example, the preimage of {4, 9} under the squaring function is the set {−3,−2,+2,+3}.
Synonyms[edit]
Translations[edit]
set containing exactly every member of the domain of a function such that the member is mapped by the function onto an element of a given subset of the codomain of the function
