三さん体たい問もん題だい

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.

• 三さん体たい問もん題だいは古こ典てん力りき学がくの難なん問もんの一ひとつだ。

  The three-body problem is one of the difficult problems in classical mechanics.

• ポアンカレは三さん体たい問もん題だいの研けん究きゅうでカオス理り論ろんの先さき駆がけとなった。

  Poincaré pioneered chaos theory through his study of the three-body problem.