9 0 1 ), ▁Jules ▁T ann ery ▁( 1 8 4 8 – 1 9 1 0 ), ▁Gast on ▁Dar b oux ▁( 1 8 4 2 – 1 9 1 7 ), ▁Paul ▁App ell ▁( 1 8 5 5 – 1 9 3 0 ), ▁É mile ▁Pic ard ▁( 1 8 5 6 – 1 9 4 1 ), ▁Ed ou ard ▁G ours at ▁( 1 8 5 8 – 1 9 3 6 ), ▁and ▁Henri ▁Po inc ar é ▁( 1 8 5 4 – 1 9 1 2 ) ▁whose ▁lect ures ▁were ▁what ▁Cart an ▁thought ▁most ▁highly ▁of . ▁ ▁After ▁gradu ation ▁from ▁the ▁É cole ▁Norm ale ▁Super ie ure ▁in ▁ 1 8 9 1 , ▁Cart an ▁was ▁draft ed ▁into ▁the ▁French ▁army , ▁where ▁he ▁served ▁one ▁year ▁and ▁att ained ▁the ▁rank ▁of ▁ser ge ant . ▁For ▁next ▁two ▁years ▁( 1 8 9 2 – 1 8 9 4 ) ▁Cart an ▁returned ▁to ▁E NS ▁and , ▁following ▁the ▁advice ▁of ▁his ▁class mate ▁Arthur ▁T resse ▁( 1 8 6 8 – 1 9 5 8 ) ▁who ▁studied ▁under ▁Soph us ▁Lie ▁in ▁the ▁years ▁ 1 8 8 8 – 1 8 8 9 , ▁worked ▁on ▁the ▁subject ▁of ▁classification ▁of ▁simple ▁Lie ▁groups , ▁which ▁was ▁started ▁by ▁Wilhelm ▁K illing . ▁In ▁ 1 8 9 2 ▁Lie ▁came ▁to ▁Paris , ▁at ▁the ▁inv itation