isabelle/valid/mathd_numbertheory_64.thy (11 lines of code) (raw):
(*
Authors: Wenda Li
*)
theory mathd_numbertheory_64
imports Complex_Main "HOL-Computational_Algebra.Computational_Algebra"
"HOL-Number_Theory.Number_Theory"
begin
theorem mathd_numbertheory_64 :
"(LEAST x ::nat. [30 * x = 42] (mod 47)) = 39"
sorry
end