isabelle/valid/mathd_numbertheory_42.thy (16 lines of code) (raw):

(* Authors: Wenda Li *) theory mathd_numbertheory_42 imports Complex_Main "HOL-Computational_Algebra.Computational_Algebra" begin theorem mathd_numbertheory_42: fixes u v :: nat assumes "27 * u mod 40 = 17" and "27 * v mod 40 = 17" and "u < 40" and "v < 80" and "40 < v" shows "(u + v) = 62" sorry end