What date is associated with e that is reminiscent of its first appearance in written form 100 years earlier?

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- May 22nd 2010, 09:40 AMNowIsForeverdate of e
What date is associated with e that is reminiscent of its first appearance in written form 100 years earlier?

- May 22nd 2010, 09:47 AMHallsofIvy
How about "Feb. 7, 1828"?

That doesn't quite work since the term "e" was used**two**hundred years earlier, not one hundred. - May 22nd 2010, 11:55 AMNowIsForever
Exactly! However, I was just looking for 1828. "...

**two**hundred...? Quoting Wikipedia e (mathematical constant):

"The first known use of the constant, represented by the letter*b*, was in correspondence from Gottfried Leibniz to Christiaan Huygens in 1690 and 1691. Leonhard Euler started to use the letter*e*for the constant in 1727 or,[4] and the first use of**1728***e*in a publication was Euler's*Mechanica*(1736). While in the subsequent years some researchers used the letter*c*,*e*was more common and eventually became the standard." - May 23rd 2010, 04:11 AMHallsofIvy
Ah! The

**number**"2.71828...", which is what I thought you asked about, was used by 1628 but called "b".