The first mention of the natural logarithm was by Nicholas Mercator in his work 
Logarithmotechnia published in 1668, [ 2 ] although the mathematics teacher 
John Speidell had already in 1619 compiled a table on the natural logarithm. [ 
3 ] It was formerly also called hyperbolic logarithm, [ 4 ] as it corresponds 
to the area under a hyperbola . It is also sometimes referred to as the 
Napierian logarithm , although the original meaning of this term is slightly 
different. 

??? 

----- Original Message -----
Joanna: 

> But, no doubt, Sabri can tell us more about the math. 

Here is some math: 

As n ---> infinity, (1 +1/n)^n ---> e, where e = 2.718... 

This "e" shows everywhere in natural sciences that rely on math. With 
out it, and its inverse, the natural logarithm, much of natural 
sciences would not have been what they are today. 

Guess from where this "e" and, its inverse, "the natural logarithm" originated? 

Hint-1: The answer starts with the letter "f", although the next 
letter is not "u" but, "i". 

Hint-2: "Debt, The First 5000 Years" by David Graeber 

Best, 
Sabri 
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