Henri Poincare Quotes, Sayings, Remarks, Thoughts and Speeches
Henri Poincare Quotes and Sayings
- 1
A sane mind should not be guilty of a logical fallacy, yet there are very fine minds incapable of following mathematical demonstrations.
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- 2
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.
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- 3
A small error in the former will produce an enormous error in the latter.
Henri Poincare | Refcard PDF ↑
- 4
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.
Henri Poincare | Refcard PDF ↑
- 5
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.
Henri Poincare | Refcard PDF ↑
- 6
Facts do not speak.
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- 7
Geometry is not true, it is advantageous.
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- 8
How is an error possible in mathematics?
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- 9
Hypotheses are what we lack the least.
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- 10
Ideas rose in clouds; I felt them collide until pairs interlocked, so to speak, making a stable combination.
Henri Poincare | Refcard PDF ↑
- 11
If nature were not beautiful, it would not be worth knowing, and if nature were not worth knowing, life would not be worth living.
Henri Poincare | Refcard PDF ↑
- 12
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.
Henri Poincare | Refcard PDF ↑
- 13
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.
Henri Poincare | Refcard PDF ↑
- 14
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.
Henri Poincare | Refcard PDF ↑
- 15
In the old days when people invented a new function they had something useful in mind.
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- 16
Invention consists in avoiding the constructing of useless contraptions and in constructing the useful combinations which are in infinite minority.
Henri Poincare | Refcard PDF ↑
- 17
It has adopted the geometry most advantageous to the species or, in other words, the most convenient.
Henri Poincare | Refcard PDF ↑
- 18
It is far better to foresee even without certainty than not to foresee at all.
Henri Poincare | Refcard PDF ↑
- 19
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.
Henri Poincare | Refcard PDF ↑
- 20
It is through science that we prove, but through intuition that we discover.
Henri Poincare | Refcard PDF ↑
- 21
Just as houses are made of stones, so is science made of facts.
Henri Poincare | Refcard PDF ↑
- 22
Mathematical discoveries, small or great are never born of spontaneous generation.
Henri Poincare | Refcard PDF ↑
- 23
Mathematicians are born, not made.
Henri Poincare | Refcard PDF ↑
- 24
Mathematicians do not study objects, but relations between objects.
Henri Poincare | Refcard PDF ↑
- 25
Mathematics is the art of giving the same name to different things.
Henri Poincare | Refcard PDF ↑
- 26
Need we add that mathematicians themselves are not infallible?
Henri Poincare | Refcard PDF ↑
- 27
No more than these machines need the mathematician know what he does.
Henri Poincare | Refcard PDF ↑
- 28
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.
Henri Poincare | Refcard PDF ↑
- 29
Point set topology is a disease from which the human race will soon recover.
Henri Poincare | Refcard PDF ↑
- 30
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.
Henri Poincare | Refcard PDF ↑
- 31
Science is facts.
Henri Poincare | Refcard PDF ↑
- 32
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.
Henri Poincare | Refcard PDF ↑
- 33
The mind uses its faculty for creativity only when experience forces it to do so.
Henri Poincare | Refcard PDF ↑
- 34
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.
Henri Poincare | Refcard PDF ↑
- 35
Thought is only a flash between two long nights, but this flash is everything.
Henri Poincare | Refcard PDF ↑
- 36
Thus, they are free to replace some objects by others so long as the relations remain unchanged.
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- 37
To doubt everything, or, to believe everything, are two equally convenient solutions; both dispense with the necessity of reflection.
Henri Poincare | Refcard PDF ↑
- 38
To invent is to discern, to choose.
Henri Poincare | Refcard PDF ↑
- 39
What is it indeed that gives us the feeling of elegance in a solution, in a demonstration?
Henri Poincare | Refcard PDF ↑
