Charles Sanders Peirce Quotes
Theoretically, I grant you, there is no possibility of error in necessary reasoning. But to speak thus "theoretically," is to uselanguage in a Pickwickian sense. In practice, and in fact, mathematics is not exempt from that liability to error that affects everything that man does.
Citations
Peirce, Charles Sanders. Collected Papers of Charles Sanders Peirce. Edited by Charles Hartshorne and Paul Weiss, Harvard University Press, 1931-1935.
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Charles Sanders Peirce was an American philosopher, logician, mathematician and scientist who is sometimes known as "the father of pragmatism".