isabelle/valid/amc12b_2021_p21.thy (13 lines of code) (raw):

(* Authors: Wenda Li *) theory amc12b_2021_p21 imports Complex_Main "HOL-Computational_Algebra.Computational_Algebra" begin theorem amc12b_2021_p21: "2 \<le> (\<Sum> k \<in> {x ::real. 0 < x \<and> x powr (2 powr (sqrt 2)) = (sqrt 2) powr (2 powr x)}. k) \<and> (\<Sum> k \<in> {x :: real. 0 < x \<and> x powr (2 powr (sqrt 2)) = (sqrt 2)powr (2 powr x)}. k) < 6" sorry end