preimage

逆象, 原象, [数]前象

词形变化

preimages 复数 preimages

释义与例句

n.
  1. 1.

    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}.

    原像

    数学

    1967 [Academic Press], Francois Treves, Topological Vector Spaces, Distributions and Kernels, 2006, Dover, page 22, The preimage of a neighborhood U of 0 in E must be a neighborhood of (0,x), since (0,x) is mapped into 0.

相关短语

preimage attack preimage attacks second preimage attack second preimage attacks

词源

From pre- + image.

来源：wiktionary