2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/61703Salikhov has proved a conjecture of Kontsevich and Shoikhet by reducing it to the consideration of three families of graphs, a consideration which was left to the reader for two of those families. We show, that the conjecture is just a very particular case of the classical theorem on the Euler characteristic, well explicated by Teleman.4 pagesCombinatoricsAlgebraic Topology05C10; 05C25; 55U10text