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English: Topology is a branch of mathematics studying those properties of a geometric figure or solid that are not changed by stretching, bending and similar homeomorphisms.

See also Topology (Network).

Four Color Theorem[edit]

Knot Theory[edit]

Separation axioms[edit]

Hierarchy of separation axioms
Regularity separation axiom
Normal separation axiom
Hausdorff Space


See also Homeomorphism

Möbius strip[edit]

See also Moebius Strip and Category:Moebius strip.