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*It is called the Mathematical Constant or Euler's Number or Napier's Constant.
*It is called the Mathematical Constant or Euler's Number or Napier's Constant.
*It is the base of natural logarithm.
*It is the base of natural logarithm.
*It can be calculate the sum of infinite series: <math>e=1+(1/1)+(1/1.2)+(1/1.2.3)+(1/1.2.3.4) +...</math>
*It can be calculate the sum of infinite series: <math>e=1+\frac{1}{1}+\frac{1}{1.2}+\frac{1}{1.2.3}+\frac{1}{1.2.3.4} +...</math>
*And the inverse function of the natural logarithm function is the exponential function:
*And the inverse function of the natural logarithm function is the exponential function:
<math>f^{-1}(x) = e^x</math>.
<math>f^{-1}(x) = e^x</math>.