Often when works at a hard question, nothing good is accomplished at the first attack. Then one takes a rest, long or… — Henri Poincare Copy Share Image
For a long time the objects that mathematicians dealt with were mostly ill-defined; one believed one knew them, but one represented them… — Henri Poincare Copy Share Image
I entered an omnibus to go to some place or other. At that moment when I put my foot on the step… — Henri Poincare Copy Share Image
Thought must never submit, neither to a dogma, nor to a party, nor to a passion, nor to an interest, nor to… — Henri Poincare Copy Share Image
Ideas rose in clouds; I felt them collide until pairs interlocked, so to speak, making a stable combination. — 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 often said that experiments should be made without preconceived ideas. That is impossible. Not only would it make every experiment… — 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
