books.google.fr - The infinite! No other question has ever moved so profoundly the spirit of man; no other idea has so fruitfully stimulated his intellect; yet no other concept stands in greater need of clarification than that of the infinite. . . - David Hilbert (1862-1943) Infinity is a fathomless gulf, There is a story...https://books.google.fr/books/about/To_Infinity_and_Beyond.html?hl=fr&id=v0btBwAAQBAJ&utm_source=gb-gplus-shareTo Infinity and Beyond