British science writer David Darling that the number e is " possibly the most important number in mathematics.
Although pi is more familiar to the layperson, e is far more significant and ubiquitous in the higher reaches of the subject.
The number e, which is approximately equal to 2.71828, can be calculated in many ways.
For example, is the limit value of expression (1+1/n) raised to the nth power, when n increases indefinitely.