"projective sphere" (fwd)

boud boud w astro.uni.torun.pl
Pon, 31 Mar 2003, 19:34:10 CEST

  i received this from a friend.

The projective sphere is the 2-sphere S^2 where each point is
identified with its opposite point. So the fundamental polygon 
is a hemisphere.  Geodesics only intersect once in the projective

> Hi Boud, 
> what an irony, but I am looking for your help with Polish !!!
> Could you or your collaborators on topology in Torun 
> enlighten me with Polish term for "projective sphere" ?
> Thanks in advance,

Can anyone help?



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