▁vers i - regular ) ▁and ▁fa cially - trans itive ▁du als . ▁ ▁C ox eter ▁et ▁al . ▁( 1 9 5 4 ) ▁use ▁the ▁term ▁sem ire g ular ▁poly hed ra ▁to ▁class ify ▁uniform ▁poly hed ra ▁with ▁W yth off ▁symbol ▁of ▁the ▁form ▁p ▁q ▁| ▁r , ▁a ▁definition ▁en comp ass ing ▁only ▁six ▁of ▁the ▁Arch im ede an ▁sol ids , ▁as ▁well ▁as ▁the ▁regular ▁pr isms ▁( but ▁not ▁the ▁regular ▁anti pr isms ) ▁and ▁numerous ▁non con vex ▁sol ids . ▁Later , ▁C ox eter ▁( 1 9 7 3 ) ▁would ▁quote ▁G os set ' s ▁definition ▁without ▁comment , ▁thus ▁accepting ▁it ▁by ▁imp lication . ▁ ▁Eric ▁We is stein , ▁Robert ▁Williams ▁and ▁others ▁use ▁the ▁term ▁to ▁mean ▁the ▁convex ▁uniform ▁poly hed ra ▁ex cluding ▁the ▁five ▁regular ▁poly hed ra ▁– ▁including ▁the ▁Arch im ede an ▁sol ids , ▁the ▁uniform ▁pr isms , ▁and ▁the ▁uniform ▁anti pr isms ▁( over la pping ▁with ▁the ▁cube ▁as ▁a ▁pr ism ▁and ▁regular ▁oct ah ed ron ▁as ▁an ▁anti pr ism ). ▁ ▁Peter ▁C rom well ▁( 1 9 9 7 ) ▁writes ▁in ▁a ▁foot note ▁to ▁Page ▁ 1 4 9 ▁that , ▁" in ▁current ▁termin ology , ▁' sem ire g ular ▁poly hed ra ' ▁refers ▁to ▁the ▁Arch im ede an ▁and ▁Catal an ▁( Arch im ede