2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/39173We define a set of orthogonal functions on the complex projective space CP^{N-1}, and compute their Clebsch-Gordan coefficients as well as a large class of 6-j symbols. We also provide all the needed formulae for the generation of high-temperature expansions for U(N)-invariant spin models defined on CP^{N-1}.24 pages, no figuresHigh Energy Physics - LatticeCondensed MatterPseudo-Character Expansions for U(N)-Invariant Spin Models on CP^{N-1}text