3 ms·

Please eventually provide the answer, because I'm curious!

• Arnavion 10y ago
  The correct spelling "contractible" yields useful Google results, namely that spheres in 3 dimensions (point 4) are not contractible to a single point. Edit: ... and maybe circles (point 2) too? Not a mathematician.
  • JadeNB 10y ago
    > The correct spelling "contractible" yields useful Google results, namely that spheres in 3 dimensions (point 4) are not contractible to a single point. The claim is about the interior, not the sphere itself (which certainly is not contractible, as you say).
• ColinWright 10y ago
  You have email.