olemus
elliptkõveraga E: y² = x³ + a₁x² + a₂ x + a₃
isomorfne kõver E': y² = x³ + Da₁x² + D²a₂ x + D³a₃,
kus D on põhikorpuse element,
mis ei ole ühegi põhikorpuse elemendi ruut;
isomorfism seab kõvera E punktile (x, y)
vastavusse kõvera E' punkti (xD^-1, yD^-3/2)
= a twist of elliptic curve E over a field K is another elliptic curve which is isomorphic to E over an algebraic closure of K

ülevaateid
https://en.wikipedia.org/wiki/Twists_of_curves

https://www.ias.edu/sites/default/files/video/Kim.pdf

https://www.emis.de/journals/SIGMA/2017/083/sigma17-083.pdf