French mathematician, physicist, and philosopher of science (1854–1912) who famously formulated the ‘Poincare Conjecture,’ which went unsolved for nearly a century. ALS in French, signed “Poincare,” one page both sides, 4.5 x 7.25, April 24, 1889, from Nancy, France. Letter to the secretary of the Society of Mathematicians, in part (translated): “I have sent you the day before yesterday the list of the members of the society after having marked with pencil the names of the people to whom the circular can be sent...I have not sent my contribution...but I believe that no confusion will be possible since this list is most probably the only one you will receive dated from Nancy.” In fine condition, with central vertical and horizontal folds and light soiling. Pre-certified PSA/DNA.
This item is Pre-Certified by PSA/DNA
Buy a third-party letter of authenticity for
$50.00
*This item has been pre-certified by a trusted third-party authentication service, and by placing a bid on this item, you agree to accept the opinion of this authentication service. If you wish to have an opinion rendered by a different authenticator of your choosing, you must do so prior to your placing of any bid. RR Auction is not responsible for differing opinions submitted 30 days after the date of the sale.
We use cookies on this site to improve your experience. By using this site, you accept our use of cookies. To learn more, please see our Privacy Policy.
