140 Quotes by Henri Poincare
"If we wish to foresee the future of mathematics, our proper course is to study the history and present condition of the science."
"Mathematics is the art of giving the same name to different things."
"Experiment is the sole source of truth. It alone can teach us something new; it alone can give us certainty."
"The American public is therefore much better prepared than has been thought for investigating the origin of the notion of space."
"The geometric language is after all only a language. Space is only a word that we have believed a thing."
"Douter de tout ou tout croire, ce sont deux solutions également commodes, qui l’une et l’autre nous dispensent de réfléchir."
"But for harmony beautiful to contemplate, science would not be worth following."
"...the feeling of mathematical beauty, of the harmony of numbers and of forms, of geometric elegance. It is a genuinely aesthetic feeling, which all mathematicians know"
"There are no solved problems; there are only problems that are more or less solved."