isabelle/valid/amc12a_2008_p4.thy (10 lines of code) (raw):

(* Authors: Albert Qiaochu Jiang *) theory amc12a_2008_p4 imports Complex_Main begin theorem amc12a_2008_p4: "(\<Prod>k::nat=1..501. ((4::real) * k + 4) / (4 * k)) = 502" by eval end