Damas, Parabolas Y Mas Mistificaciones

Martin Gardner will introduce you to the possibilities of "clock arithmetic" or modular algebra, developed by the genius Karl Friedrich Gauss. Curiously, the first interested in these calculations were some Popes, concerned about the ever-sliding dates of Easter. Did these Church dignitaries already know that modular algebra is used not only to calculate calendar dates, but also to perform all kinds of illusionist tricks, for example, with playing cards and numbered tiles?