quaternionic projective line造句

例句与造句

1. The quaternionic projective line \ mathbb { HP } ^ 1 is homeomorphic to the 4-sphere.
2. From the topological point of view the quaternionic projective line is the 4-sphere, and in fact these are diffeomorphic manifolds.
3. It's difficult to find quaternionic projective line in a sentence. 用quaternionic projective line造句挺难的