▁by ▁his ▁son , ▁Prince ▁R oder ick ▁G hy ka , ▁and ▁daughter , ▁Princess ▁Ma ure en ▁G hy ka . ▁He ▁was ▁prede ce ased ▁by ▁his ▁wife ▁E ile en , ▁who ▁died ▁on ▁ 1 0 ▁February ▁ 1 9 6 3 . ▁Both ▁Prince ▁Mat ila ▁and ▁Princess ▁E ile en ▁are ▁buried ▁in ▁G unn ers bury ▁C emetery , ▁London . ▁ ▁Their ▁fun eral ▁monument ▁was ▁restored ▁in ▁ 2 0 1 0 ▁by ▁art ▁historian ▁Dr ▁Rad u ▁V aria ▁. ▁ ▁Mathemat ical ▁a est het ics ▁ ▁In ▁around ▁ 1 9 0 0 , ▁G hy ka ▁spent ▁a ▁year ▁studying ▁engineering ▁at ▁the ▁É cole ▁sup érieure ▁d ' é lect ric ité ▁de ▁Paris , ▁Wh ilst ▁there ▁he ▁developed ▁his ▁own ▁mathematical ▁ideas ▁on ▁the ▁relationship ▁between ▁therm od ynam ics ▁and ▁living ▁matter , ▁partly ▁under ▁the ▁influence ▁of ▁Gust ave ▁Le ▁Bon . ▁He ▁returned ▁to ▁mathematics ▁around ▁ 1 9 2 0 ▁when ▁Ein stein ' s ▁theories ▁were ▁published , ▁and ▁over ▁the ▁next ▁few ▁years ▁developed ▁ideas ▁on ▁the ▁mathematics ▁of ▁form ▁which ▁he ▁published ▁in ▁ 1 9 2 7 ▁as ▁Est h étique ▁des ▁proport ions ▁dans ▁la ▁nature ▁et ▁dans ▁les ▁arts , ▁and ▁re vised ▁and ▁expanded ▁in ▁his ▁two ▁volume ▁Le ▁nombre ▁d ' or . ▁R ites ▁et ▁r yth mes ▁p yth ag or ici ens ▁dans ▁le ▁development ▁de ▁la ▁civil isation ▁occident ale