Multiply Connected
A set which is Connected but not Simply Connected is called multiply connected. A Spaceis 
-Multiply Connected if it is 
-connected and if every Map from the -Sphere into it extendscontinuously over the 
-Disk
A theorem of Whitehead says that a Space is infinitely connected Iff it is contractible.
See also Connectivity, Locally Pathwise-Connected Space,Pathwise-Connected, Simply Connected- Thue-Siegel-Roth Theorem
- Thue-Siegel-Schneider-Roth Theorem
- Thue's Theorem
- Thurston's Geometrization Conjecture
- Thwaites Conjecture
- Ticktacktoe
- Tic-Tac-Toe
- Tight Closure
- Tightly Embedded
- Tiling
- Tiling Theorem
- Times
- Titanic Prime
- Titchmarsh Theorem
- Tit-for-Tat
- Tits Group
- Toeplitz Matrix
- Togliatti Surface
- Tomography
- Tooth Surface
- Topological Basis
- Topological Completion
- Topological Dimension
- Topological Entropy
- Topological Groupoid