Last Updated
：2025/12/04
reciprocant
（ plural ）
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(mathematics) A contravariant expressing a certain condition of tangency; a differential invariant.
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reciprocant
In projective geometry, the reciprocant is a contravariant that encodes a tangency condition between a curve and its polar.
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In projective geometry, the reciprocant is a contravariant that encodes a tangency condition between a curve and its polar.
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