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References to 'Euler characteristic'
1. elliptic curve by djao
2. Gauss-Bonnet theorem by rspuzio
3. Gauss-Bonnet theorem for surfaces without boundary by Simone
4. genus by mathcam
5. hairy ball theorem by rspuzio
6. Heawood number by bbukh
7. homotopy groups by bwebste
8. Morse complex by bwebste
9. Poincar\'e formula by CWoo
10. proof of Nielsen-Schreier theorem and Schreier index formula by mathcam
11. proof of Riemann-Roch theorem by bwebste
12. topics on low dimensional topology by juanman
13. topological invariant by bwebste