• In every science, after having analysed the ideas, expressing the more complicated by means of the more simple, one finds a certain number that cannot be reduced among them, and that one can define no further. These are the primitive ideas of the science; it is necessary to acquire them through experience, or through induction; it is impossible to explain them by deduction.

    "The Mathematical Philosophy of Giuseppe Peano". Philosophy of Science Vol. 30, No. 3, July 1963.
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