We give a new geometric proof of a conjecture of Fulton about the Littlewood-Richardson coefficients. This conjecture was first proved by Knutson, Tao and Woodward using the Honeycomb theory. A geometric proof was given by Belkale. Our proof is based on the geometry of the Horn cones.
Cite this article
Nicolas Ressayre, A short geometric proof of a conjecture of Fulton. Enseign. Math. 57 (2011), no. 1/2, pp. 103–115DOI 10.4171/LEM/57-1-5