Mathematical Sciences Classification System
08Axx - Algebraic structures 
[See also  03C05]
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                            08A02Relational systems, laws of composition
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                            08A05Structure theory
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                            08A30Subalgebras, congruence relations
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                            08A35Automorphisms, endomorphisms
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                            08A40Operations, polynomials, primal algebras
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                            08A45Equational compactness
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                            08A50
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                            08A55Partial algebras
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                            08A60Unary algebras
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                            08A62Finitary algebras
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                            08A65Infinitary algebras
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                            08A68Heterogeneous algebras
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                            08A70Applications of universal algebra in computer science
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                            08A72Fuzzy algebraic structures
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                            08A99None of the above, but in this section