When1: 1889
Who: Joseph Bertrand [Bertrand, Joseph]
What: mathematician
Where: Paris, France
works\ Calculation of Probabilities [1889]
Detail: He lived 1822 to 1900. Because circle chords can have varying angles to tangents, for example perpendicular to radius and parallel to tangent, different ways of selecting chords lead to different probabilities that chord is less than inscribed-equilateral-triangle side {Bertrand's paradox}.
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Date Modified: 2022.0224