| 单词 | ideal plane |
| 释义 | > as lemmasideal plane ideal plane n. Geometry the single plane at infinity that is regarded as containing all the ideal lines of a space. ΚΠ 1900 Math. Gaz. 1 314 All these ideal points and lines must be regarded as lying in one ideal plane, in order that there may be one ideal point on every line, one ideal line in every plane. 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. 1992 H. Eves Fund. Mod. Elem. Geom. i. 10 The collection of added ideal points and ideal lines is regarded as an ideal plane, called the plane at infinity, which contains no ordinary points or lines. < as lemmas |
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