isabelle/valid/algebra_amgm_faxinrrp2msqrt2geq2mxm1div2x.thy (10 lines of code) (raw):

(* Authors: Albert Qiaochu Jiang *) theory algebra_amgm_faxinrrp2msqrt2geq2mxm1div2x imports Complex_Main begin theorem algebra_amgm_faxinrrp2msqrt2geq2mxm1div2x: "\<And>x. (x>0) \<Longrightarrow> 2 - sqrt 2 \<ge> 2 - x - 1/ (2 * x)" sorry end