As an application of a recently developed variational perturbation theory we find the first 22 terms of the convergent strong-coupling series expansion for the ground state energy of the quartic anharmonic oscillator.
Borel Resummation Method with Conformal Mapping and the Ground State Energy of the Quartic Anharmonic Oscillator
The Complexity of Translationally Invariant Problems beyond Ground State Energies
A simple formula for ground state energy of a two-electron atom
