Using formal power series one can define, over any field, a class of functions including algebraic and classical modular functions over C. Under simple conditions the power series will have coefficients in a subring of the field - say Z - and this plays a role in Apery's proof of the irrationality of \zeta(3). Remarkably over a finite field all such functions/power series are algebraic. I will call attention to a natural - but open - problem in this area.
Mon, 04/06/2018 - 14:00 to 15:00
Room 70A, Ross Building, Jerusalem, Israel