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sa ne distram cu niste toruri

 
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Dragos Fratila
Newton


Joined: 04 Oct 2007
Posts: 335
Location: Paris

PostPosted: Fri Jun 17, 2011 10:58 am    Post subject: sa ne distram cu niste toruri Reply with quote

Sa va amuzati si voi cu varietatile astea:

http://img715.imageshack.us/i/alotoftori.png

Sunt 4 varieti facute din sume conexe de toruri. "Puncte puncte" din desen inseamna ca se continua dupa modelul respectiv la infinit.

Problema e urmatorea: sa se determine care dintre varietatile 1,2,3,4 din poza de mai sus sunt homeomorfe si care nu.
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