- #36

#### wrobel

Science Advisor

- 997

- 860

the sphere is a compact set and a chart is notSummary::Formal proof that it does not exist a global coordinate chart on a 2-sphere

So, from a formal mathematical point of view, how to prove it ? Just because there is not a (global)homeomorphismbetween the 2-sphere and the Euclidean plane ? Thanks.