Template:Are You Sure/October 7
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Derangement diagram: All 24 permutations of 4 elements, with highlighting of the 9 derangements.
• ... that a Derangement is a permutation of the elements of a set such that no element appears in its original position; and that the principle of derangement was first considered by mathematician Pierre Raymond de Montmort in 1708, and that he solved it in 1713, as did Nicholas Bernoulli at about the same time?
• ... that mathematician Olga Taussky-Todd (30 August 1906 — 7 October 1995) was hired by a group of German mathematicians to find and correct the many mathematical errors in the works of David Hilbert, so that they could be collected into a volume to be presented to Hilbert on his birthday, and that there was only one paper (on the continuum hypothesis) which Taussky-Todd was unable to repair?