Cluster algebras with coefficients and relative Calabi-Yau structures
De Bernhard Keller
Categorified Crystal Bases on Localized Quantum Coordinate Rings and Cellular Crystals
De Toshiki Nakashima
Apparaît dans la collection : Symmetry in Geometry and Analysis
For three representations of the principal series of the conformal group of the sphere $S^n$, the dimension of the space of continuous trilinear invariant forms on $C^\infty (S^n) \times C^\infty (S^n) \times C^\infty (S^n)$ is determined, and a basis is described. The results are intimately connected with the study of conformally covariant differential and bi-differential operators.