Geodesic
Theorem on Vector Basis in Geometric Problems
Matematičeskoe obrazovanie, no. 1 (2010), pp. 6-11 
N. S. Astapov. Theorem on Vector Basis in Geometric Problems. Matematičeskoe obrazovanie, no. 1 (2010), pp. 6-11. http://geodesic.mathdoc.fr/item/MO_2010_1_a1/
@article{MO_2010_1_a1,
     author = {N. S. Astapov},
     title = {Theorem on {Vector} {Basis} in {Geometric} {Problems}},
     journal = {Matemati\v{c}eskoe obrazovanie},
     pages = {6--11},
     year = {2010},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MO_2010_1_a1/}
}
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Voir la notice de l'article provenant de la source Math-Net.Ru

The theorem on vector basis provides a universal and powerful tool for solving numerous geometric problems.