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Aug 19, 2020 at 7:37 comment added mapf Not that it really matters, but when I did some research on the book (because I want to cite it) I found that the relation was already pointed out in the first edition of the book published in 1911.
Oct 29, 2015 at 1:06 comment added Aksakal Old math texts are so much more fun to read than today's writing
Oct 29, 2015 at 1:02 comment added Glen_b +1 Indeed, my quote of Pearson 1895 indicates that it's something he noticed rather than derived.
Oct 29, 2015 at 0:57 history answered Aksakal CC BY-SA 3.0