Geodesic
Rational homology of the order complex of zero sets of homogeneous quadratic polynomial systems in $\mathbb R^3$
Informatics and Automation, Modern problems of mathematics, mechanics, and mathematical physics, Tome 290 (2015), pp. 211-225 
V. A. Vassiliev. Rational homology of the order complex of zero sets of homogeneous quadratic polynomial systems in $\mathbb R^3$. Informatics and Automation, Modern problems of mathematics, mechanics, and mathematical physics, Tome 290 (2015), pp. 211-225. http://geodesic.mathdoc.fr/item/TRSPY_2015_290_a17/
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     title = {Rational homology of the order complex of zero sets of homogeneous quadratic polynomial systems in~$\mathbb R^3$},
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Voir la notice de l'article provenant de la source Math-Net.Ru

The naturally topologized order complex of proper algebraic subsets in $\mathbb R\mathrm P^2$ defined by systems of quadratic forms has the rational homology of $S^{13}$.

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