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**Simply connected:**
A domain $D$ is simply connected if every simple closed curve / loop can ve continously shrunk to a point.  
- every sphere can be shrunk to a point in som way. 



> [!note]- Etymologi
> - Topos (τόπος): "plats"
> - Graphia (γραφή): "skrift" eller "att rita"
 
 [[Second homology]]