Onto

предлог 1) на; в (в пространственном значении) Например: to get onto a horse — сесть на лошадь to jump onto a tram — вскочить в трамвай 2) в значении "сообщать кому-либо что-либо", "вводить в курс дела" Например: Put me onto your ideas. — Расскажите мне о ваших идеях.

Большой англо-русский словарь

Onto

I. preposition 1. to a position on 2. in or into a state of awareness about Example: put me onto your methods 3. — used as a function word to indicate a set each element of which is the image of at least one element of another set Example: a function mapping the set S onto the set T II. adjective mapping elements in such a way that every element in one set is the image of at least one element in another set Example: a function that is one-to-one and onto

Merriam-Webster's Collegiate Dictionary

Onto

surjection

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