http://www.math.utah.edu/~palais/pi.pdf http://www.math.utah.edu/~palais/pi.pdf Yes, it is an enlightening article. After I read it the first time, I immediate

http://www.math.utah.edu/~palais/pi.pdf http://www.math.utah.edu/~palais/pi.pdf Yes, it is an enlightening article. After I read it the first time, I immediately began going through my old Complex Analysis and Physics textbooks. That was one of the few experiences I would describe as 'thunderstruck'.