Prime Hankel representation for the prime-cyclotomic gamma function

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Let ΓPcyc\Gamma_{\mathbb P}^{\mathrm{cyc}} be the prime-cyclotomic gamma function. A prime Hankel representation should consist of an oriented contour C⊂C×\mathscr C\subset\mathbb C^\times, a specified branch of w−z=exp⁡(−zlog⁡w)w^{-z}=\exp(-z\log w) along C\mathscr C, and a canonical prime-cyclotomic kernel KP(w)\mathcal K_{\mathbb P}(w) independent of zz, such that on a nonempty vertical strip

1ΓPcyc(z)=12πi∫CKP(w)w−z dw.\frac{1}{\Gamma_{\mathbb P}^{\mathrm{cyc}}(z)}=\frac{1}{2\pi i}\int_{\mathscr C}\mathcal K_{\mathbb P}(w)w^{-z}\,\mathrm dw.

The right-hand side should admit entire continuation to C\mathbb C, with the recurrence ΓPcyc(z+1)=eLPcyc(z)ΓPcyc(z)\Gamma_{\mathbb P}^{\mathrm{cyc}}(z+1)=e^{L_{\mathbb P}^{\mathrm{cyc}}(z)}\Gamma_{\mathbb P}^{\mathrm{cyc}}(z) and reflection law ΓPcyc(z)ΓPcyc(1−z)=1\Gamma_{\mathbb P}^{\mathrm{cyc}}(z)\Gamma_{\mathbb P}^{\mathrm{cyc}}(1-z)=1 induced by explicit transformations of the contour kernel. This would provide a contour analogue of the classical Hankel representation while preserving the defining prime-cyclotomic symmetries; the source does not state whether such a representation is known.

References

Primary source

Brian Diaz, “Factorial Calculi and the Canonical Stirling Defect of the Prime Bhargava Factorial”, arXiv:2607.21979 (2026).

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