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References to 'hyperplane'
1. central collineations by Algeboy
2. degree (map of spheres) by drini
3. face of a convex set, alternative definition of by mps
4. Hahn-Banach theorem (geometric form) by azdbacks4234
5. lemma on projection of countable sets by rspuzio
6. polarities and forms by Algeboy
7. projective space by rmilson
8. proof of Borsuk-Ulam theorem by bwebste
9. proof of ham sandwich theorem by Statusx
10. proof of the Burnside basis theorem by Algeboy
11. simplicial complex by djao
12. variety by mps
13. Weyl group by mathcam