"We probably all agree that eventually reducing a difficult problem to a "nice" situation is at the heart of mathematics."

"Together with many other people and after a long development I could prove that a Poincaré duality group of cohomolog…"

"Still another important area is Poincaré duality for groups, invented by Robert Bieri and myself. They behave like ma…"

"The artist's mission is to give shape to what is eternal in nature, to reveal its inherent beauty; he sublimates the …"

"When I enter a forest of tall fir trees, reaching toward the sky, I am surrounded, right and left, by their trunks, w…"

"Vive Vienne. Vive la Secession."

"This beautiful head [of Valentine Godé-Darel], this whole body, like a Byzantine empress on the mosaics of Ravenna - …"

"I call 'parallelism' any kind of repetition. When I feel most strongly the charm of things in nature, there is always…"

"'Parallelism' can be pointed out in the different parts of a single object, looked at alone; it is even more obvious …"

"If a few people who have come together for the same purpose sit around a table, we can understand them as parallels m…"