There are no solved problems; there are only problems that are more or less solved. — Henri Poincare Copy Share Image
I then began to study arithmetical questions without any great apparent result, and without suspecting that they could have the least connexion… — Henri Poincare Copy Share Image
It is far better to foresee even without certainty than not to foresee at all. — Henri Poincare Copy Share Image
A first fact should surprise us, or rather would surprise us if we were not used to it. How does it happen… — Henri Poincare Copy Share Image
Experiment is the sole source of truth. It alone can teach us something new; it alone can give us certainty. — Henri Poincare Copy Share Image
The mathematical facts worthy of being studied are those which, by their analogy with other facts, are capable of leading us to the knowledge… — Henri Poincare Copy Share Image
. . . by natural selection our mind has adapted itself to the conditions of the external world. It has adopted the geometry most… — Henri Poincare Copy Share Image
If we knew exactly the laws of nature and the situation of the universe at the initial moment, we could predict exactly the situation… — Henri Poincare Copy Share Image
Absolute space, that is to say, the mark to which it would be necessary to refer the earth to know whether it really moves,… — Henri Poincare Copy Share Image
Absolute space, that is to say, the mark to which it would be necessary to refer the earth to know whether it really moves,… — Henri Poincare Copy Share Image
A cat is witty, he has nerve, he knows how to do precisely the right thing at the right moment. — Henri Poincare Copy Share Image
In the old days when people invented a new function they had something useful in mind. — Henri Poincare Copy Share Image
Mathematics has a threefold purpose. It must provide an instrument for the study of nature. But this is not all: it has a philosophical… — Henri Poincare Copy Share Image
