# acoustical reciprocity theorem

- • akustična teorema recipročnost

*English-Serbian dictionary.
2013.*

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**Quadratic residue**— In number theory, an integer q is called a quadratic residue modulo n if it is congruent to a perfect square modulo n; i.e., if there exists an integer x such that: Otherwise, q is called a quadratic nonresidue modulo n. Originally an abstract… … Wikipedia