#topology

Topology is an area of mathematics concerned with the properties of space that are preserved under continuous deformations

https://en.wikipedia.org/wiki/Topology https://en.wikipedia.org/wiki/Topological_space https://en.wikipedia.org/wiki/General_topology https://en.wikipedia.org/wiki/Algebraic_topology https://en.wikipedia.org/wiki/Differential_topology https://en.wikipedia.org/wiki/Geometric_topology http://mathworld.wolfram.com/Topology.html http://www-history.mcs.st-and.ac.uk/HistTopics/Topology_in_mathematics.html https://en.wikipedia.org/wiki/Homeomorphism