Euler\'s phi-function

Eu·ler's phi-func·tion

 
noun Mathematics.
the function that assigns to each integer the number of positive integers less than the given integer and relatively prime to the given integer.
Also called phi-function.

Origin:
named after L. Euler
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Euler's phi-function is always a great word to know.
So is exponent. Does it mean:
a function having the dependent variable expressed directly in terms of the independent variables, such as y = 3x + 4
a symbol or number placed above and after another symbol or number to denote the power to which the latter is to be raised
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