45 results on '"Fernández, A M."'
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2. Comment on “Removing non-smoothness in solving Black-Scholes equation using a perturbation method”
3. Comment on: “On the characteristic polynomial of an effective Hamiltonian”
4. Quantum uncertainty: ΔxΔp experimental evaluation and direct visualization
5. Comment on “Generalized differential transform method to differential-difference equation” by L. Zou et al.
6. Comment on: “Entanglement in three coupled oscillators” [Phys. Lett. A 384 (2020) 126134]
7. On the Hellmann-Feynman theorem in statistical mechanics
8. Energy content in linear mechanical systems with arbitrary time dependence
9. Weakly (and not so weakly) bound states of a relativistic particle in one dimension
10. Chirality, helicity and the rotational content of electromagnetic fields
11. Remark on Landau quantization, Aharonov–Bohm effect and two-dimensional pseudoharmonic quantum dot around a screw dislocation
12. An accurate algorithm to calculate the Hurst exponent of self-similar processes
13. Comment on “Energy levels of a spherical quantum dot in a confining potential” [Phys. Lett. A 373 (2009) 679]
14. Comment on: “Series solution to the Thomas–Fermi equation” [Phys. Lett. A 365 (2007) 111]
15. Accurate calculation of the complex eigenvalues of the Schrödinger equation with an exponential potential
16. Calculation of bound states and resonances in perturbed Coulomb models
17. Dalgarno–Lewis perturbation theory for scattering states
18. Comment on: “Perturbation theory from an iteration method” [Phys. Lett. A 340 (2005) 388]
19. Is there any unique frequency operator for quantum-mechanical anharmonic oscillators
20. Comparison of alternative improved perturbative methods for nonlinear oscillations
21. A new approximation method for time-dependent problems in quantum mechanics
22. Classical and quantum-mechanical observables by perturbation theory
23. Orthogonal functions invariant for the time-dependent harmonic oscillator
24. Construction of invariants by perturbation theory
25. On the Morse oscillator with a kinetic coupling
26. Resonances for a perturbed Coulomb potential
27. Strong coupling expansion for anharmonic oscillators and perturbed Coulomb potentials
28. Exact and approximate solutions to the Schrödinger equation for the harmonic oscillator with a singular perturbation
29. Convergent power-series solutions to the Schrödinger equation with the potential
30. Alternative perturbation expansions for partially solvable quantum-mechanical models
31. Covergent renormalized perturbation series
32. Energy eigenvalues from a modified operator method
33. Time evolution operator for a class of miltidimensional driven oscillators
34. On the power series method for eigenvalue calculation
35. Branch points of the eigenvalues of a polar symmetric top in a uniform electric field
36. Convergence radii of the Rayleigh-Schrödinger perturbation series for a diatomic rigid polar molecule in a uniform electric field
37. On the convergence of the operator method perturbation series
38. An approximate analytical expression for the energies of the tight-bound states of the Zeeman effect in hydrogen
39. Convergent perturbation series for coupled oscillators
40. Generalized Hill determinant method
41. Further comments on the modified operator method
42. Improved renormalized perturbation series
43. Modified expansion
44. Modified [formula omitted] expansion
45. Comment on the operator method and perturbational solution of the Schrödinger equation
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