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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 [[logarithm]]s as the base, called a [[natural logarithm]]. ''e'' is named for [[Swiss]] [[mathematician]] [[Leonhard Euler]], though he did not discover the constant.

'''''Euler NUmber''''', symbolized ''e'', is a useful [[mathematical]] constant which is a [[transcendental]] number approximately equal to 2.718281828459045 . ''e'' can be used in [[logarithm]]s 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:

It has some remarkable properties. For example: