変へん分ぶん原げん理り

noun

variational principle

A fundamental concept in physics and mathematics where the solution to a problem is found by extremizing a functional. Used in classical mechanics, quantum mechanics, and other fields.

• 変へん分ぶん原げん理りは、解かい析せき力りき学がくの基き礎そとなる重じゅう要ような考かんがえ方かたです。

  The variational principle is an important concept that forms the basis of analytical mechanics.

• 量りょう子し力りき学がくでは、変へん分ぶん原げん理りを用もちいて近きん似じ解かいを求もとめることがあります。

  In quantum mechanics, approximate solutions are sometimes obtained using the variational principle.