06XX 


Order, lattices, ordered algebraic structures [See also 18B35] 

06Axx 

Ordered sets 


06A05 
Total order 


06A06 
Partial order, general 


06A07 
Combinatorics of partially ordered sets 


06A11 
Algebraic aspects of posets 


06A12 
Semilattices [See also 20M10; for topological semilattices see 22A26] 


06A15 
Galois correspondences, closure operators 


06A75 
Generalizations of ordered sets 


06A99 
None of the above, but in this section 