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" It has adopted the geometry most advantageous to the species or, in other words, the most convenient. "
Henri Poincare
Geometry
Words
Most
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" Mathematicians do not study objects, but relations between objects. "
Henri Poincare
Objects
Study
Mathematicians
" Point set topology is a disease from which the human race will soon recover. "
Henri Poincare
Disease
Race
Soon
" 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
" Ideas rose in clouds; I felt them collide until pairs interlocked, so to speak, making a stable combination. "
Henri Poincare
Rose
Pairs
Ideas
" 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
" 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
" 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
" To doubt everything, or, to believe everything, are two equally convenient solutions; both dispense with the necessity of reflection. "
Henri Poincare
Reflection
Believe
Doubt
" Geometry is not true, it is advantageous. "
Henri Poincare
True
Geometry
" What is it indeed that gives us the feeling of elegance in a solution, in a demonstration? "
Henri Poincare
Elegance
Solution
Indeed
" To invent is to discern, to choose. "
Henri Poincare
Discern
Choose
Invent
" 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
" Science is facts. "
Henri Poincare
Facts
Science
" Facts do not speak. "
Henri Poincare
Facts
Speak
" How is an error possible in mathematics? "
Henri Poincare
Error
Possible
Mathematics
" In the old days when people invented a new function they had something useful in mind. "
Henri Poincare
Old Days
Days
Mind
" Thus, they are free to replace some objects by others so long as the relations remain unchanged. "
Henri Poincare
Replace
Long
Free
" Hypotheses are what we lack the least. "
Henri Poincare
Least
Hypotheses
Lack
" 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
Go
Problems
Physics
" 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
Predict
Same
Laws
" It is far better to foresee even without certainty than not to foresee at all. "
Henri Poincare
Better
Certainty
Far
" 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
Capable
Knowledge
Worthy
" No more than these machines need the mathematician know what he does. "
Henri Poincare
Machines
More
Need
" Need we add that mathematicians themselves are not infallible? "
Henri Poincare
Infallible
Mathematicians
Need
" 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
" Mathematical discoveries, small or great are never born of spontaneous generation. "
Henri Poincare
Great
Never
Born
" Mathematicians are born, not made. "
Henri Poincare
Made
Mathematicians
Born
" The mind uses its faculty for creativity only when experience forces it to do so. "
Henri Poincare
Experience
Uses
Only
" 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. "
Henri Poincare
Artist
Work
Same