olemus
matemaatiliste struktuuride sarnasus, pööratav homomorfism

Wiktionary:
1. similarity of form
2. a one-to-one correspondence
2.3. (category theory) a morphism which has a two-sided inverse; the composition of the morphism and such an inverse yields either one of two identity morphisms (depending on the order of composition)

ülevaateid
https://mathworld.wolfram.com/Isomorphism.html

https://mathworld.wolfram.com/NaturalIsomorphism.html

https://mathworld.wolfram.com/Meet-Isomorphism.html

https://mathworld.wolfram.com/Join-Isomorphism.html

https://encyclopediaofmath.org/wiki/Isomorphism

http://www.math.clemson.edu/~macaule/classes/m20_math4120/slides/math4120_lecture-4-01_h.pdf

https://en.wikipedia.org/wiki/Isomorphism

https://en.wikipedia.org/wiki/Group_isomorphism

https://en.wikipedia.org/wiki/Graph_isomorphism