noun
three-body problem
Physics term for the problem of predicting the motion of three celestial bodies under mutual gravitational attraction. No simple closed-form solution exists.
三体問題は古典力学の難問の一つだ。
The three-body problem is one of the difficult problems in classical mechanics.
ポアンカレは三体問題の研究でカオス理論の先駆けとなった。
Poincaré pioneered chaos theory through his study of the three-body problem.