定てい理り

noun

theorem; proposition

A mathematical or logical statement that has been proven or is presented for proof. In everyday contexts, it can also refer to a firmly established principle.

• ピタゴラスの定てい理りは直ちょっ角かく三さん角かく形けいに適てき用ようされる。

  The Pythagorean theorem applies to right triangles.

• この定てい理りを証しょう明めいするのに数すう時じ間かんかかった。

  It took several hours to prove this theorem.