| Table 1: Approximation of the energy levels of the harmonic oscillator in . Here, represents the energy state, is the exact solution for the energy, is the upper bound for obtained by the variational analysis, with the eigenvalues of H minimized over the box size, and is the optimal value obtained. The table shows the energies of the first states, . | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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