The source is in
Gerhardt, C.I. (editor), "Die Philosophischen Schriften von G.W. Leibniz",
7 volumes, photographic reprint of the original 1875-90 edition, Georg Olms
Verlagsbuchhandlung, Hildesheim 1978.
My notes say vol. 7, p.200. I believe this was in a letter but I don't
remember to whom.
Martin Davis
Visiting Scholar UC Berkeley
Professor Emeritus, NYU
martin@eipye.com
(Add 1 and get 0)
http://www.eipye.com