| 单词 | ideal point |
| 释义 | > as lemmasideal point ideal point n. Geometry the single point at infinity at which two parallel lines are regarded as intersecting. ΘΚΠ the world > relative properties > number > geometry > point > [noun] > of intersection or contact > of specific lines or curves > at infinity ideal point1879 focoid1881 1879 Encycl. Brit. X. 389/1 We may say that all points at infinity in a line appear to us as one, and may be replaced by a single ‘ideal’ point. 1937 B. C. Patterson Projective Geom. i. 5 We assume..the existence of an ideal plane of space, the locus of all ideal points and ideal lines of space. 2001 Educ. Probl. Math. 48 171 The imaginary √−1, an ideal point (a point at infinity)..—all were viewed at the time they were introduced as ‘ideal’ (unreal?) objects needed to bring about desired goals. < as lemmas |
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