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References to 'sphere (metric space)'
1. 3-manifold by juanman
2. alternate characterization of curl by stevecheng
3. Anosov diffeomorphism by Koro
4. antipodal isothermic points by pahio
5. ball by CWoo
6. Behrend's construction by bbukh
7. cell attachment by yark
8. conjugate points by rspuzio
9. Erd\H{o}s number by Mravinci
10. examples of compact spaces by yark
11. four-color conjecture by bbukh
12. genus by mathcam
13. geodesic by Mathprof
14. Heawood number by bbukh
15. history of mathematics in the United States of America by PrimeFan
16. homotopy groups by bwebste
17. invariant forms on representations of compact groups by bwebste
18. join by mathcam
19. Jordan curve theorem by rmilson
20. K-distance set by rspuzio
21. Kempe chain by marijke
22. Klein bottle by vernondalhart
23. planar graph by archibal
24. proof of Borsuk-Ulam theorem by bwebste
25. proof of Brouwer fixed point theorem by bwebste
26. related rates by rmilson
27. Riemann sphere by CWoo
28. section of a fiber bundle by antonio
29. shape operator by juanman
30. the sphere is indecomposable as a topological space by joking
31. Thom class by antonio