Solitons: Differential equations, symmetries, and infinite-dimensional algebras
《Solitons: Differential equations, symmetries, and infinite-dimensional algebras》 · 第 67 页 · Definition 3.1
A scheme is a locally ringed space $(X,\mathcal O_X)$ which admits an open covering $X=\bigcup_{i\in I}U_i$ such that all locally ringed spaces $(U_i,\mathcal O_X|_{U_i})$ are affine schemes.