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