The O-M-O triatomic molecule: Basic unit of cuprates&manganates/ AuthorsS. Tsintsarska, M. Ivanovich, M. Georgiev, A. Gochev/ Abstract- fermion hopping energies, g n, μν - fermion-boson coupling constants, ω n bare phonon frequencies. Point-group symmetry requirement: Γ ph ⊂ Γ 1 ⊗ Γ 2