Paul Jean Joseph Barbarin (20 October 1855, Tarbes – 28 September 1931) was a French mathematician, specializing in geometry.
[1] At the time of his death he was a professor at the École Spéciale des Travaux Publics in Paris.
In a 1904 article published in the journal Science, G. B. Halsted gave an English summary of the two French reports.
[3] Athanase Papadopoulos edited and translated Lobachevsky's Pangéométrie ou Précis de géométrie fondée sur une théorie générale et rigoureuse des parallèles (Pangeometry) and provided a footnote concerning Barbarin:[4] P. Barbarin, La géométrie non euclidienne ...
We owe him several results on hyperbolic geometry, in particular, the first complete classification of conics and quadrics in the non-Euclidean plane, and new formulae for volumes of tetrahedra.Barbarin was an Invited Speaker of the ICM in 1928 in Bologna.