degenerate conic
In a vexatious manner; so as to give annoyance.
(mathematics) A conic section that is reducible as the union of two lines.
A surname originating as a patronymic or as a matronymic.
Within a republic.
代数幾何の講義で、教授は縮退円錐曲線（2本の直線の和集合になる円錐曲線）をどのように2本の交わる直線として表現できるかを示した。
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