[Depression is] common to all people with an excessively logical education who work in applied mathematics: It is a kind of pessimism resulting from … - Walter Pitts

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[Depression is] common to all people with an excessively logical education who work in applied mathematics: It is a kind of pessimism resulting from an inability to believe in what people call the Principle of Induction, or the principle of the Uniformity of Nature. Since one cannot prove, or even render probable a priori, that the sun should rise tomorrow, we cannot really believe it shall.