2
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Who discovered Napier's number?

I read Bernoulli calculated it, Napier discovered it but it is e because of Euler.

I know how Bernoulli calculated it but where did Napier see it?

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    $\begingroup$ Napier did not "see" it, he (or rather his translator Oughtred) calculated some logarithms to base $e$ without needing the base itself. Several other people calculated related numbers before Bernoulli, but none of them isolated $e$, see MacTutor's history of $e$. $\endgroup$
    – Conifold
    Commented May 1, 2020 at 6:22
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    $\begingroup$ Napier used an approximate value. See hsm.stackexchange.com/questions/42/… $\endgroup$ Commented May 2, 2020 at 1:35

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