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单词 sharp-cone
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sharp-cone
sharp-cone n. Mathematics (see quot. 1872).
ΚΠ
1872 A. Cayley Coll. Math. Papers (1895) VIII. 102 The special forms of (quadri-)cones; these are: 1° The sharp-cone, or plane-pair; that is, a pair of two planes, intersecting in a line called the axis, the vertex being in this case an indeterminate point on the axis.
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