31.15.X- Alternative approaches
- 31.15.xf Finite-difference schemes
- 31.15.xg Semiclassical methods
- 31.15.xh Group-theoretical methods (see also 02.20.-a Group theory in mathematical methods in physics)
- 31.15.xj Hyperspherical methods
- 31.15.xk Path-integral methods
- 31.15.xm Quasiparticle methods
- 31.15.xp Perturbation theory
- 31.15.xr Self-consistent-field methods
- 31.15.xt Variational techniques
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31.15.xv Molecular dynamics and other numerical methods (for simulation techniques for biomolecules, see 87.15.ak, ap)
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- 31.15.xw Valence bond calculations