isabelle/valid/amc12b_2002_p11.thy (14 lines of code) (raw):

(* Authors: Wenda Li *) theory amc12b_2002_p11 imports Complex_Main "HOL-Computational_Algebra.Computational_Algebra" begin theorem amc12b_2002_p11: fixes a b::nat assumes "prime a" and "prime b" and "prime (a+b)" and "prime (a-b)" shows "prime (a + b + (a - b + (a + b)))" sorry end