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References to 'concurrent'
1. Brianchon theorem by vmoraru
2. Ceva's theorem by drini
3. conic section by drini
4. Desargues' theorem by drini
5. fundamental theorem on isogonal lines by drini
6. Gergonne point by drini
7. height by Mathprof
8. homothetic by drini
9. isogonal conjugate by drini
10. Miquel point by vmoraru
11. Nicolas Rashevsky by bci1
12. proof of Ceva's theorem by yark
13. proof of Pappus's theorem by mathcam
14. trigonometric version of Ceva's theorem by drini
15. Van Aubel theorem by drini