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exists_irrational_of_five_seven_nine_eleven
Specification
At least one of $\zeta(5), \zeta(7), \zeta(9)$ or $\zeta(11)$ is irrational. [Zu01] W. Zudilin (2001). _One of the numbers ζ(5), ζ(7), ζ(9), ζ(11) is irrational_. Russ. Math. Surv. 56 (4): 774–776.
Lean 4 Statement
theorem exists_irrational_of_five_seven_nine_eleven :
{5, 7, 9, 11} ∩ { a | ∃ x, Irrational x ∧ riemannZeta a = x} |>.Nonempty
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