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References to 'triangle center'
1. $\mathbb{R}^2 \setminus C$ is path connected if $C$ is countable by silverfish
2. annulus by akrowne
3. area of regular polygon by Wkbj79
4. centralizer by yark
5. centre of mass by stevecheng
6. circle line picking by PrimeFan
7. concyclic by CWoo
8. continuous geometry by CWoo
9. diameter by drini
10. differential geometry by rspuzio
11. great circle by Wkbj79
12. imaginaries by mathcam
13. integral by djao
14. Lipschitz inverse mapping theorem by Koro
15. locus by pahio
16. Newton's line by vmoraru
17. orthocenter by Mathprof
18. orthogonal circles by pahio
19. Pappus's centroid theorem by stevecheng
20. parallel curve by stitch
21. polar tangential angle by pahio
22. projective plane by yark
23. proof of butterfly theorem by drini
24. proof of casus irreducibilis for real fields by rm50
25. proof of Heine-Borel theorem by stevecheng
26. properties of parallel curves by pahio
27. radius by akrowne
28. Seifert fiber space by juanman
29. sines law proof by drini
30. singular solution by pahio
31. some proofs for triangle theorems by Wkbj79
32. tetrahedron by rspuzio