Mathematical Sciences Classification System
06-XX - Order, lattices, ordered algebraic structures [See also 18B35]
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                            06-00General reference works (handbooks, dictionaries, bibliographies, etc.)
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                            06-01Instructional exposition (textbooks, tutorial papers, etc.)
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                            06-02Research exposition (monographs, survey articles)
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                            06-03Historical (must also be assigned at least one classification number from Section 01)
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                            06-04Explicit machine computation and programs (not the theory of computation or programming)
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                            06-06Proceedings, conferences, collections, etc.
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                            (+16)Ordered sets
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                            (+7)Lattices
[See also 03G10] - 
                            
                            (+3)Modular lattices, complemented lattices
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                            (+7)Distributive lattices
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                            (+16)Boolean algebras (Boolean rings)
[See also 03G05] - 
                            
                            (+15)Ordered structures