👉 In mathematics, a basisphenoidal system is a type of quantum mechanical system in which the wavefunction evolves according to a certain set of rules. In this case, the basisphenoidal system is defined as a quantum mechanical system that has a single mode with a fixed energy state and no other modes. The basisphenoidal systems are often used for modeling quantum systems such as atoms or molecules. In classical mechanics, a basisphenoidal system has a Hamiltonian H = E + iσ, where
