補ほ題だい

noun

lemma; lemmata

In mathematics, a proposition proved as a step toward a larger theorem. The plural 'lemmata' is less common.

• この補ほ題だいは定てい理りの証しょう明めいに必ひつ要ようだ。

  This lemma is necessary for the proof of the theorem.

• 彼かれは論ろん