Rigor

Definition and stakes

Portrait of Patrick Manson Patrick Manson,  Tropical Diseases (1919)

“ Intermittent fever or ague.—— Every typical malarial fever is made up of a series of pyrexial attacks which recur at definite intervals of twenty-four, forty-eight, or seventy-two hours. Each attack consists of a stage of rigor, a stage of heat, and a stage of sweating; these are followed by a period, " the interval," of apyrexia -actual or relative. The duration and intensity of the constituent stages vary considerably. On the whole, they observe a certain proportion to each other; as a rule, the more pronounced the rigor, the higher the fever and the more profuse the sweating. ”
Source: Wikisource

Portrait of Henri Poincaré Henri Poincaré,  The Foundations of Science: Science and Hypothesis…

“ But do you think mathematics has attained absolute rigor without making any sacrifice? Not at all; what it has gained in rigor it has lost in objectivity. It is by separating itself from reality that it has acquired this perfect purity. We may freely run over its whole domain, formerly bristling with obstacles, but these obstacles have not disappeared. ”
Source: Gutenberg

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