We are justified in calling numbers a free creation of the human mind.
That which is provable, ought not to be believed in science without proof.
"I see it, but I don't believe it."
For what I have accomplished and what I have become, I have to to thank my industry much more, my indefatigable working, rather than any outstanding talent.
As professor in the Polytechnic School in Zürich I found myself for the first time obliged to lecture upon the elements of the differential calculus and felt more keenly than ever before the lack of a really scientific foundation for arithmetic.
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