本文给出了关于二阶曲面的代数定义和射影定义之间的等价性定理。
This article is told the sense of equivalence between algebraic definition and projecting definition.
本文的第二部分首先给出了射影系统的概念并且描述了线性码和射影系统之间的等价性，因而我们就可以用几何语言给出线性码一个新的描述。
In the first, the projective system was given in section two, and the equivalence between linear codes and projective was proofed. So we can use geometric language to describe linear codes.
本文列举了一维基本形间射影对应的各种定义，并证明了它们之间的等价性。
The article lists four kinds of definitions of projective correspondences in one-dimensional basic figures, and proves that those are equivalent.
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