(Asked by bcross at math.iuiui.edu on the Q&A board at JMM)
Are there any nonlinear solutions to $f(x+1) - f(x) = f'(x)$?
[Ed: please retag appropriately]
(Asked by bcross at math.iuiui.edu on the Q&A board at JMM)
Are there any nonlinear solutions to $f(x+1) - f(x) = f'(x)$?
[Ed: please retag appropriately]