> 54-XX General topology > 54HXX Connections with other structures, applications

54H05 Descriptive set theory (topological aspects of Borel, analytic, projective, etc. sets)	54H10 Topological representations of algebraic systems	54H11 Topological groups
54H12 Topological lattices, etc.	54H13 Topological fields, rings, etc.	54H15 Transformation groups and semigroups
54H20 Topological dynamics	54H25 Fixed-point and coincidence theorems	54H99 None of the above, but in this section

54HXX Connections with other structures, applications