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" Facts do not speak. "
Henri Poincare
Facts
Speak
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" Ideas rose in clouds; I felt them collide until pairs interlocked, so to speak, making a stable combination. "
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" 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. "
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Happy
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" In the old days when people invented a new function they had something useful in mind. "
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Days
Mind
" 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. "
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Go
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" Mathematics is the art of giving the same name to different things. "
Henri Poincare
Same
Name
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" 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. "
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Capable
Knowledge
Worthy
" It is far better to foresee even without certainty than not to foresee at all. "
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Better
Certainty
Far
" How is an error possible in mathematics? "
Henri Poincare
Error
Possible
Mathematics
" It is through science that we prove, but through intuition that we discover. "
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Prove
Through
Science
" Need we add that mathematicians themselves are not infallible? "
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Infallible
Mathematicians
Need
" Geometry is not true, it is advantageous. "
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True
Geometry
" 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
Science
Nature
Mathematics
" It has adopted the geometry most advantageous to the species or, in other words, the most convenient. "
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Geometry
Words
Most
" Invention consists in avoiding the constructing of useless contraptions and in constructing the useful combinations which are in infinite minority. "
Henri Poincare
Useless
Minority
Infinite
" Thus, they are free to replace some objects by others so long as the relations remain unchanged. "
Henri Poincare
Replace
Long
Free
" Science is facts. "
Henri Poincare
Facts
Science
" 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
Worth
Life
Beautiful
" A sane mind should not be guilty of a logical fallacy, yet there are very fine minds incapable of following mathematical demonstrations. "
Henri Poincare
Sane
Logical
Guilty
" Just as houses are made of stones, so is science made of facts. "
Henri Poincare
Houses
Science
Stones
" A small error in the former will produce an enormous error in the latter. "
Henri Poincare
Error
Will
Produce
" To invent is to discern, to choose. "
Henri Poincare
Discern
Choose
Invent
" 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
Science
Stones
Up
" Mathematicians do not study objects, but relations between objects. "
Henri Poincare
Objects
Study
Mathematicians
" 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
Earth
Mark
Space
" Mathematical discoveries, small or great are never born of spontaneous generation. "
Henri Poincare
Great
Never
Born
" 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
Fail
Small
See
" 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
Beautiful
Nature
He
" Hypotheses are what we lack the least. "
Henri Poincare
Least
Hypotheses
Lack
" 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
Nature
Universe
Moment
" To doubt everything, or, to believe everything, are two equally convenient solutions; both dispense with the necessity of reflection. "
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Reflection
Believe
Doubt