Todo

• Find a reference for Mahler's theorem
• http://en.wikipedia.org/wiki/Wikipedia:WikiProject_Mathematics#Things_to_do
• Check the calculations on Q-derivative

• http://en.wikipedia.org/wiki/Arithmetic_function#Dirichlet_convolution
• http://en.wikipedia.org/wiki/Dirichlet_convolution#Dirichlet_series
• http://en.wikipedia.org/wiki/Multiplicative_function#Convolution
• http://en.wikipedia.org/wiki/Analytic_number_theory#Dirichlet_series

This seems like a duplication of effort. What should be done about it?

• Gauss sum Gaussian period Quadratic Gauss sum

• Improve the infinite descent article, maybe add Fermat and/or Eulers example.