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e is a useful mathematical constant which is a transcendental number approximately equal to 2.718281828459045 . e can be used in logarithms as the base, called a natural logarithm. e is named for Swiss mathematician Leonhard Euler, though he did not discover the constant.

It has some remarkable properties. For example:

(i.e. the exponetial function is an eigenfunction of the derivative operator, with eigenvalue 1).

Formulae for e