Hermite Functions and Fourier Series

Using normalized Hermite functions, we construct bases in the space of square integrable functions on the unit circle (L-2(C)) and in l(2)(Z), which are related to each other by means of the Fourier transform and the discrete Fourier transform. These relations are unitary. The construction of orthonormal bases requires the use of the Gramm-Schmidt method. On both spaces, we have provided ladder operators with the same properties as the ladder operators for the one-dimensional quantum oscillator. These operators are linear combinations of some multiplication- and differentiation-like operators that, when applied to periodic functions, preserve periodicity. Finally, we have constructed riggings for both L-2(C) and l(2)(Z), so that all the mentioned operators are continuous.

Automated summary

The article discusses constructing bases in the space of square integrable functions on the unit circle and l(2)(Z) using normalized Hermite functions, which are related through Fourier transforms. The Gramm-Schmidt method is used for building orthonormal bases with ladder operators similar to those of the one-dimensional quantum oscillator. Rigging was constructed for both spaces to ensure continuity of operators mentioned.