A **cover** $\{U_i\}_{i\in I}$ of a scheme by affine open subsets is **semiseparated** if $U_i\cap U_j$ is also affine for every pair $(i,j)\in I\times I$. An algebraic scheme is **semiseparated** if it has an affine cover which is semiseparated. The notion is introduced in

- Thomason, Trobaugh, in Grothendieck Festschrift 1989

category: algebraic geometry

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