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2.4 algebraic » 2.1 algebraic, 2.2 algebraic, 2.5 algebraic
24 algebraic » 2 algebraic, 14 algebraic, 21 algebraic
4 algebraic » 2 algebraic, 1 algebraic

1 Table of Contents: ... -- 2.3 Categories -- 2.4 Variety characterization, quasi-variety characterization -- 2.5 Free algebras...