Solitons: Differential equations, symmetries, and infinite-dimensional algebras
《Solitons: Differential equations, symmetries, and infinite-dimensional algebras》 · 第 76 页 · Definition 3.16(c)
A scheme $X$ is called irreducible if its underlying topological space is irreducible, i.e., if $X$ is nonempty and is not the union of two proper closed subsets.