例句與造句

1. The properties of being ruled or doubly ruled are preserved by projective maps, and therefore are concepts of projective geometry.
2. Bijective functions are essential to many areas of mathematics including the definitions of isomorphism, homeomorphism, diffeomorphism, permutation group, and projective map.
3. While the projective linear group of the plane is 3-transitive ( any three distinct points can be mapped to any other three points ), and indeed simply 3-transitive ( there is a " unique " projective map taking any triple to another triple ), with the cross ratio thus being the unique projective invariant of a set of four points, there are basic geometric invariants in higher dimension.
4. It's difficult to find projective map in a sentence. 用projective map造句挺難的