caption doctoral_advisor image_size nationality fields workplaces birth_date doctoral_students image article_title name
pierre -rrb- berthelot in 1981 -lrb- photo by george bergman alexander grothendieck 225px french mathematics university of rennes 1943 claude dumas-montagnon pierre berthelot.jpeg pierre berthelot
 pierre berthelot
pierre berthelot

pierre berthelot -lrb- -rrb- is a mathematician at the university of rennes .
he developed crystalline cohomology and rigid cohomology .
