pré-imagem
1. In mathematics, the set of all elements in the domain of a function that map to a given element in the codomain; the inverse image of a set under a function
The preimage of the set {2, 4} under the function f(x) = 2x consists of {1, 2}.
A pré-imagem do conjunto {2, 4} sob a função f(x) = 2x consiste em {1, 2}.
2. The original or earlier version of something that came before an image or representation
The preimage of the photograph is the actual scene that was captured.
A pré-imagem da fotografia é a cena real que foi capturada.
This is a technical mathematical term used primarily in academic and scientific contexts in both English-speaking countries and Brazil. It is rarely used in casual conversation and is confined to mathematics education, particularly in courses on set theory, abstract algebra, and functional analysis. The Portuguese translation 'pré-imagem' maintains the same technical status in Brazilian and European Portuguese mathematical discourse.
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