+A [mathematical constant](/wiki/mathematical_constant) is a fixed, well-defined [real number](/wiki/real_number) that emerges naturally in various mathematical contexts. These unchanging values, such as [pi](/wiki/pi) or [e](/wiki/e), often serve as fundamental building blocks in formulas and theories across different branches of mathematics.
+## See also
+- [Number](/wiki/number)
+- [Pi](/wiki/pi)
+- [E](/wiki/e)
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