$e |- ( ph -> P e. NN ) $. $e |- ( ph -> R e. NN ) $. $e |- I = ( P INTRO R ) $. $e |- ( ph -> E e. NN ) $. $e |- ( ph -> D e. NN ) $. $e |- A = ( Base ` ( poly1 ` ZZ ) ) $. $e |- ( ph -> F e. A ) $. $e |- ( ph -> D I F ) $. $e |- ( ph -> E I F ) $. $p |- ( ph -> ( D x. E ) I F ) $.
Closure statement of introspective relation