Thus, they are free to replace some objects by others so long as the relations remain unchanged.
More Quotes from Henri Poincare:
Thought is only a flash between two long nights, but this flash is everything.Henri Poincare
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
Science is facts just as houses are made of stones, so is science made of facts but a pile of stones is not a house And a collection of facts is not necessarily science.
Henri Poincare
Mathematics is the art of giving the same name to different things.
Henri Poincare
What is it indeed that gives us the feeling of elegance in a solution, in a demonstration?
Henri Poincare
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
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