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math-ph2005
Dynamique des nombres et physique des oscillateurs
Jacky Cresson
We consider the superheterodyning system discovered by Armstrong and Schottky in 1924. This system is the basic piece of any communication system. We prove that the frequency spect…
math-ph2004
Explicit modular formulae and symmetries of RCFT's I
Antoine Coste
We derive compact formulae for modular transformations of WZ characters. We start with algebra A_1 at positive level k=n-2, for which we can easily provide some description of isom…