Stirling-Ramanujan constants are exponential periods
arxiv(2024)
摘要
Ramanujan studied a general class of Stirling constants that are the
resummation of some natural divergent series. These constants include the
classical Euler-Mascheroni, Stirling and Glaisher-Kinkelin constants. We find
natural integral representations for all these constants that appear as
exponential periods in the field ℚ (t,e^-t) which reveals their
natural transalgebraic nature. We conjecture that all these constants are
transcendental numbers. Euler-Mascheroni's and Stirling's integral formula are
classical, but the integral formula for Glaisher-Kinkelin is new, as well as
the integral formulas for the higher Stirling-Ramanujan constants. The method
presented generalizes naturally to prove that many other constants are
exponential periods over the field ℚ(t,e^-t).
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