Commutative algebra. Commutative rings. Commutative algebra -- Instructional exposition (textbooks, tutorial papers, etc.). Number theory -- Algebraic number theory: global fields -- Algebraic numbers; rings of algebraic integers. Commutative algebra -- Computational aspects and applications -- None of the above, but in this section. Number theory -- Instructional exposition (textbooks, tutorial papers, etc.). Algebraic geometry -- Foundations -- Varieties and morphisms.