Timeline for What is the quantity 2(handles)+crosscaps called?
Current License: CC BY-SA 3.0
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| when toggle format | what | by | license | comment | |
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| Aug 25, 2017 at 16:16 | comment | added | Chris Schommer-Pries | The surface $N_1 = S_{0,1}$ with $k=1$ is the projective plane. It has Betti number $b_1 = 0$ since it's homology is all torsion. But $2g + k =1$ in this case. | |
| May 6, 2011 at 7:45 | vote | accept | Tony Huynh | ||
| May 6, 2011 at 1:26 | history | answered | Qiaochu Yuan | CC BY-SA 3.0 |