Alhazen's problem
(transitive) To remove from the clergy; to revoke the clerical status of.
(mathematics) A mathematical problem in which lines drawn from two points in the plane of a circle must meet at a point on the circumference, making equal angles with the normal at that point.
(US) Possessive of youse (standing in for yours).
plural of changeout
セミナーで教授は、チョークで描いた円と二つの印を使い、円周上の点を求める古典的な数学の問題（平面上の二点から引いた線がその点の法線と等しい角度を成すようにする問題）を示し、反射した光線が円周上の一点で交わる様子を実演した。
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