Henri Poincare Quotes

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It is through science that we prove, but through intuition that we discover.

It is far better to foresee even without certainty than not to foresee at all.

Science is built up of facts, as a house is with stones. But a collection of facts is no more a science than a heap of stones is a house.

The scientist does not study nature because it is useful; he studies it because he delights in it, and he delights in it because it is beautiful.

If nature were not beautiful, it would not be worth knowing, and if nature were not worth knowing, life would not be worth living.

Hypotheses are what we lack the least.

Thought is only a flash between two long nights, but this flash is everything.

The mind uses its faculty for creativity only when experience forces it to do so.

Mathematics is the art of giving the same name to different things.

Mathematical discoveries, small or great are never born of spontaneous generation.

Mathematicians do not study objects, but relations between objects.

Geometry is not true, it is advantageous.

It has adopted the geometry most advantageous to the species or, in other words, the most convenient.

The mathematical facts worthy of being studied are those which, by their analogy with other facts, are capable of leading us to the knowledge of a physical law.

Just as houses are made of stones, so is science made of facts.

Science is facts.

Mathematicians are born, not made.

In the old days when people invented a new function they had something useful in mind.

How is an error possible in mathematics?

A sane mind should not be guilty of a logical fallacy, yet there are very fine minds incapable of following mathematical demonstrations.

Need we add that mathematicians themselves are not infallible?

Point set topology is a disease from which the human race will soon recover.

What is it indeed that gives us the feeling of elegance in a solution, in a demonstration?

It is the harmony of the diverse parts, their symmetry, their happy balance; in a word it is all that introduces order, all that gives unity, that permits us to see clearly and to comprehend at once both the ensemble and the details.

No more than these machines need the mathematician know what he does.

A scientist worthy of his name, about all a mathematician, experiences in his work the same impression as an artist; his pleasure is as great and of the same nature.

Thus, they are free to replace some objects by others so long as the relations remain unchanged.

Absolute space, that is to say, the mark to which it would be necessary to refer the earth to know whether it really moves, has no objective existence.

One would have to have completely forgotten the history of science so as to not remember that the desire to know nature has had the most constant and the happiest influence on the development of mathematics.

Facts do not speak.

If one looks at the different problems of the integral calculus which arise naturally when one wishes to go deep into the different parts of physics, it is impossible not to be struck by the analogies existing.

To doubt everything, or, to believe everything, are two equally convenient solutions; both dispense with the necessity of reflection.

Ideas rose in clouds; I felt them collide until pairs interlocked, so to speak, making a stable combination.

Invention consists in avoiding the constructing of useless contraptions and in constructing the useful combinations which are in infinite minority.

To invent is to discern, to choose.

A very small cause which escapes our notice determines a considerable effect that we cannot fail to see, and then we say that the effect is due to chance.

If we knew exactly the laws of nature and the situation of the universe at the initial moment, we could predict exactly the situation of the same universe at a succeeding moment.

If that enabled us to predict the succeeding situation with the same approximation, that is all we require, and we should say that the phenomenon had been predicted, that it is governed by the laws.

A small error in the former will produce an enormous error in the latter.

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