511.3 Mathematical logic (Symbolic logic)
511.33 Order, lattices, ordered algebraic structures
511.332 Partially ordered sets de
511.3 Mathematische Logik (Symbolische Logik)
511.33 Ordnungen, Verbände, geordnete algebraische Strukturen
511.332 Halbgeordnete Mengen
Dewey Decimal Classification
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