This tutorial will be based on the paper "Invariant semidefinite programs", written jointly with Dion C. Gijswijt, Alexander Schrijver, Frank Vallentin
arXiv:1007.2905
In the last years many results in the area of semidefinite programming were obtained for semidefinite programs, either finite or infinite dimensional, which are invariant under the action of a group. We shall present methods involving group representations and orthogonal polynomials that allow to reduce such programs.
Applications to coding theory and to related questions of discrete geometry will be developed.