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- Thread starter matqkks
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quadratic residue - quadratic reciprocity - cubic reciprocity - sphere packing.

Another example as for many number theoretic results is cryptography: quadratic-rest-problem.

I'm sure there are a lot more results which are probably more sophisticated, too.

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http://www2.gcc.edu/dept/math/faculty/BancroftED/teaching/handouts/quadratic_reciprocity.pdf

https://www.maths.tcd.ie/pub/Maths/Courseware/NumberTheory/QuadraticResidues.pdf

http://math453spring2009.wikidot.com/lecture-18

http://sites.millersville.edu/bikenaga/number-theory/quadratic-residues/quadratic-residues.html

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