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Jan 28, 2011 at 0:34 comment added JBorger Dear Joe -- That's actually not the theorem of Ritt's I had in mind, although it is one close to my heart. I've added the theorem I was thinking of to my response.
Jan 27, 2011 at 17:02 comment added user5831 There is a nice (and maybe more "readable/modern") proof of Ritt's theorem by Eremenko math.purdue.edu/~eremenko/dvi/feq-e.pdf.
Jan 27, 2011 at 13:27 history answered Joe Silverman CC BY-SA 2.5