References

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"e (Mathematical Constant)." Wikipedia, Wikimedia Foundation, 12 Dec. 2017, en.wikipedia.org/wiki/E_(mathematical_constant)#cite_note-4.

Fendt, Walter. "First and Second Derivative of a Function." First and Second Derivative of a Function, www.walter-fendt.de/html5/men/derivative12_en.htm.

Gourdon, X. "Letter to Plouffe." Index of /, plouffe.fr/simon/constants/expof1.txt.

"Inverse of Function Demonstration." Interactive Inverse Function Applet. Explore the Relation between a Function, Its Inverse and Their x,y Values | Math Warehouse Applet, www.mathwarehouse.com/algebra/relation/inverse-of-function-applet-demonstration.php.

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numberphile. "e (Euler's Number) - Numberphile." YouTube, YouTube, 19 Dec. 2016, www.youtube.com/watch?v=AuA2EAgAegE.

TheIntegralCALC. "Why Can't Logarithms Be Negative?" YouTube, YouTube, 11 Oct. 2016, www.youtube.com/watch?time_continue=11&v=8i4Ce251p1Y.