TY  - BOOK
AU  - Kelley, John L.
TI  - General Topology
SN  - 9780486815442
U1  - 514 
PY  - 2017///
CY  - New York
PB  - Dover Publications
KW  - Topology
KW  - Topologie
N1  - Chapter 0: Prliminaries
Subsets and complements; Union and Intersection
Class calculus
Relations
Relation calculus, equivalence relations
ER  -