“… treatises on mechanics do not clearly distinguish between what is experiment, what is mathematical reasoning, what is convention, and what is hypothesis.”

—  Henri Poincaré , book Science and Hypothesis

... les traités de mécanique ne distinguent pas bien nettement ce qui est expérience, ce qui est raisonnement mathématique, ce qui est convention, ce qui est hypothèse.
Source: Science and Hypothesis (1901), Ch. VI: The Classical Mechanics, Tr. George Bruce Halsted (1913)

Original

… les traités de mécanique ne distinguent pas bien nettement ce qui est expérience, ce qui est raisonnement mathématique, ce qui est convention, ce qui est hypothèse.

Science and Hypothesis (1901)

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Henri Poincaré 49
French mathematician, physicist, engineer, and philosopher … 1854–1912

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