+Euler's Number, denoted by *e*, is a fundamental [mathematical constant](/wiki/mathematical_constant) approximately equal to 2.71828. It is the unique base for the [natural logarithm](/wiki/natural_log) and appears universally in calculations involving continuous growth and [Calculus](/wiki/calculus).
+## See also
+- [Pi](/wiki/pi)
+- [Golden Ratio](/wiki/golden_ratio)
+- [Logarithm](/wiki/logarithm)
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