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" Point set topology is a disease from which the human race will soon recover. "
Henri Poincare
Disease
Race
Soon
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" 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 invent is to discern, to choose. "
Henri Poincare
Discern
Choose
Invent
" 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
" Need we add that mathematicians themselves are not infallible? "
Henri Poincare
Infallible
Mathematicians
Need
" A small error in the former will produce an enormous error in the latter. "
Henri Poincare
Error
Will
Produce
" 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
" It has adopted the geometry most advantageous to the species or, in other words, the most convenient. "
Henri Poincare
Geometry
Words
Most
" 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
" Hypotheses are what we lack the least. "
Henri Poincare
Least
Hypotheses
Lack
" 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
" It is through science that we prove, but through intuition that we discover. "
Henri Poincare
Prove
Through
Science
" To doubt everything, or, to believe everything, are two equally convenient solutions; both dispense with the necessity of reflection. "
Henri Poincare
Reflection
Believe
Doubt
" The mind uses its faculty for creativity only when experience forces it to do so. "
Henri Poincare
Experience
Uses
Only
" Ideas rose in clouds; I felt them collide until pairs interlocked, so to speak, making a stable combination. "
Henri Poincare
Rose
Pairs
Ideas
" Mathematical discoveries, small or great are never born of spontaneous generation. "
Henri Poincare
Great
Never
Born
" What is it indeed that gives us the feeling of elegance in a solution, in a demonstration? "
Henri Poincare
Elegance
Solution
Indeed
" Mathematicians do not study objects, but relations between objects. "
Henri Poincare
Objects
Study
Mathematicians
" Just as houses are made of stones, so is science made of facts. "
Henri Poincare
Houses
Science
Stones
" 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
Unity
Happy
Balance
" No more than these machines need the mathematician know what he does. "
Henri Poincare
Machines
More
Need
" Mathematics is the art of giving the same name to different things. "
Henri Poincare
Same
Name
Mathematics
" 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
" 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
" In the old days when people invented a new function they had something useful in mind. "
Henri Poincare
Old Days
Days
Mind
" 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
" Thought is only a flash between two long nights, but this flash is everything. "
Henri Poincare
Long
Only
Thought
" Mathematicians are born, not made. "
Henri Poincare
Made
Mathematicians
Born
" Facts do not speak. "
Henri Poincare
Facts
Speak
" How is an error possible in mathematics? "
Henri Poincare
Error
Possible
Mathematics
" It is far better to foresee even without certainty than not to foresee at all. "
Henri Poincare
Better
Certainty
Far