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    • A note on Dirichlet and Fejér kernels 

      López Bonilla, José; Vidal Beltrán, Sergio; Yalja Montiel, Jesús (2009-02-25)
      We exhibit a trigonometric identity wich implies a link between the kernels ofDirichlet and Fejér.
    • An approach to ladder operators for the two-dimensional harmonic oscillator 

      López Bonilla, José; Cruz Beltrán, L. (2009-02-25)
      We show that elementary properties of associated Laguerre polynomials generatethe ladder operators for the harmonic oscillator radial wave function in two dimensions.Keywords: Harmonic oscillator, ladder operators, Laguerre ...