A meromorphic function can have poles but no essential singularities.
亚纯函数可以有极点,但没有本性奇点。
On a compact Riemann surface, every non-constant meromorphic function must have as many poles as zeros when counted with multiplicity.
在紧黎曼曲面上,每个非常数的亚纯函数在按重数计数时,极点与零点的“总量”必须相匹配。