Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Please help me on calculating orbifold euler characteristics

  1. Aug 16, 2005 #1
    how could v 'calculate' the orbifold euler char. using String theoriests' formula for the same ? For example, i know the Euler char. of S^1/Z_2 is 1, when we identify the x to -x points of S^1(not the antipodal points i.e. dimetrically opposite points, but putting a mirror along the horizontal line cutting the circle and identifying the mirror image points). But i don't know how to use the string theoreists' formula and don't get what summation over commutating group elements means(in S^1/Z_2 case, they are {1,-1} ).
    S^2/Z_2 would be more elaborative perhaps ?
  2. jcsd
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Can you offer guidance or do you also need help?