preimage
名词 n.
英文释义
名词 n.
-
For a given function, the set of all elements of the domain that are mapped into a given subset of the codomain; (formally) given a function ƒ : X → Y and a subset B ⊆ Y, the set ƒ⁻¹(B) = {x ∈ X : ƒ(x) ∈ B}.
— The preimage of #92;#123;4,9#92;#125; under the function f#58;#92;R#92;rightarrow#92;R#58;f(x)#61;x² is the set #92;#123;-3,-2,#43;2,#43;3#92;#125;.
词形变化
词源
Etymology tree
Proto-Indo-European *per-
Proto-Indo-European *preh₂-
Proto-Indo-European *-i
Proto-Indo-European *préh₂i?
Proto-Italic *prai
Proto-Italic *prai-
Latin prae-lbor.
Middle English pre-
English pre-
English image
English preimage
From pre- + image.
Proto-Indo-European *per-
Proto-Indo-European *preh₂-
Proto-Indo-European *-i
Proto-Indo-European *préh₂i?
Proto-Italic *prai
Proto-Italic *prai-
Latin prae-lbor.
Middle English pre-
English pre-
English image
English preimage
From pre- + image.
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数据来源: Wiktionary