Reciprocity via Reciprocants

Authors: Matthew Baker

10 pages. v2: Rewrote Appendix B, fixed miscellaneous typos
License: CC BY 4.0

Abstract: The determinant of a skew-symmetric matrix has a canonical square root given by the Pfaffian. Similarly, the resultant of two reciprocal polynomials of even degree has a canonical square root given by their reciprocant. Computing the reciprocant of two cyclotomic polynomials yields a short and elegant proof of the Law of Quadratic Reciprocity.

Submitted to arXiv on 05 Sep. 2023

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