olemus
funktsiooni \(f\colon X\rightarrow Y\) sihthulga \(Y\) alamhulgale \(A\)
vastav hulk \(f^{-1}(A)=\{x\in X\colon f(x)\in A\}\),
mis koosneb kõigist sellistest lähtehulga \(X\) elementidest,
mille kujutised kuuluvad hulka \(A\)

Wiktionary:
the set of points that map to a given point (or set of points) under a specified function

ülevaateid
http://mathonline.wikidot.com/direct-image-inverse-image-and-inverse-functions

https://math.libretexts.org/Bookshelves/Mathematical_Logic_and_Proof/Transition_to_Higher_Mathematics_(Dumas_and_McCarthy)/01%3A_New_Page/1.5%3A_Images_and_Inverses

https://server.math.umanitoba.ca/~schippers/Example_Inverse_and_Direct_Images.pdf

vt ka
- originaal (2)