Examples of parity in the following topics:
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The Fundamental Theorem of Algebra- This last remark, together with the alternative statement of the fundamental theorem of algebra, tells us that the parity of the real roots (counted with multiplicity) of a polynomial with real coefficients must be the same as the parity of the degree of said polynomial.
 
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Even and Odd Functions- Oftentimes, the parity of a function will reveal whether it is odd or even.