isabelle/valid/numbertheory_2dvd4expn.thy (12 lines of code) (raw):
(*
Authors: Albert Qiaochu Jiang
*)
theory numbertheory_2dvd4expn imports
Complex_Main
begin
theorem numbertheory_2dvd4expn:
fixes n :: nat
assumes h0 : "n \<noteq> 0"
shows "(2::nat) dvd 4^n"
sorry
end