An Invitation to General Algebra and Universal Constructions
From the contents: Free groups; A Cook's tour of other universal
constructions; Ordered sets, induction, and the Axiom of Choice;
Lattices, closure operators, and Galois connections; Categories and
functors; Universal constructions in category-theoretic terms; Varieties
of algebras; Algebra and coalgebra objects in categories, and functors
having adjoints
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