06-XX	Order, lattices, ordered algebraic structures [See also 18B35]
06-00	General reference works (handbooks, dictionaries, bibliographies, etc.)
06-01	Instructional exposition (textbooks, tutorial papers, etc.)
06-02	Research exposition (monographs, survey articles)
06-03	Historical {!must also be assigned at least one classification number from section 01}
06-04	Explicit machine computation and programs (not the theory of computation or programming)
06-06	Proceedings, conferences, collections, etc.
06Axx	Ordered sets
06A05	Total order
06A06	Partial order, general
06A07	Combinatorics of partially ordered sets
06A11	Algebraic aspects of posets [See also 05E25]
06A12	Semilattices [See also 20M10] {For topological semilattices, see 22A26}
06A15	Galois correspondences, closure operators
06A99	None of the above, but in this section
06Bxx	Lattices [See also 03G10]
06B05	Structure theory
06B10	Ideals, congruence relations
06B15	Representation theory
06B20	Varieties of lattices
06B23	Complete lattices, completions
06B25	Free lattices, projective lattices, word problems [See also 03D40, 08A50, 20F10]
06B30	Topological lattices, order topologies [See also 06F30, 22A26, 54F05, 54H12]
06B35	Continuous lattices and posets, applications [See also 06B30, 06D10, 06F30, 18B35, 22A26, 68Q10]
06B99	None of the above, but in this section
06Cxx	Modular lattices, complemented lattices
06C05	Modular lattices, Desarguesian lattices
06C10	Semimodular lattices, geometric lattices
06C15	Complemented lattices, orthocomplemented lattices and posets [See also 03G12, 81P10]
06C20	Complemented modular lattices, continuous geometries
06C99	None of the above, but in this section
06Dxx	Distributive lattices
06D05	Structure and representation theory
06D10	Complete distributivity
06D15	Pseudocomplemented lattices
06D20	Heyting algebras [See also 03G25]
06D22	Frames, locales {For topological questions, see 54-XX}
06D25	Post algebras [See also 03G20]
06D30	De_Morgan algebras, Lukasiewicz algebras [See also 03G20]
06D35	MV-algebras
06D50	Lattices and duality
06D72	Fuzzy lattices (soft algebras) and related topics
06D99	None of the above, but in this section
06Exx	Boolean algebras (Boolean rings) [See also 03G05]
06E05	Structure theory
06E10	Chain conditions, complete algebras
06E15	Stone space and related constructions
06E20	Ring-theoretic properties [See also 16E50, 16G30]
06E25	Boolean algebras with additional operations (diagonalizable algebras, etc.) [See also 03G25, 03F45]
06E30	Boolean functions [See also 94C10]
06E99	None of the above, but in this section
06Fxx	Ordered structures
06F05	Ordered semigroups and monoids [See also 20Mxx]
06F07	Quantales
06F10	Noether lattices
06F15	Ordered groups [See also 20F60]
06F20	Ordered Abelian groups, Riesz groups, ordered linear spaces [See also 46A40]
06F25	Ordered rings, algebras, modules {For ordered fields, see 12J15} [See also 13J25, 16W80]
06F30	Topological lattices, order topologies [See also 06B30, 22A26, 54F05, 54H12]
06F35	BCK-algebras, BCI-algebras [See also 03G25]
06F99	None of the above, but in this section