Ch ess ▁Olymp i ad ▁compet itors ▁Category : Span ish ▁ch ess ▁writers ▁Category : 2 0 th - century ▁ch ess ▁players <0x0A> </s> ▁Le od am as ▁of ▁Th as os ▁( , ▁c . ▁ 3 8 0 ▁BC ) ▁was ▁a ▁Greek ▁math ematic ian ▁and ▁a ▁contemporary ▁of ▁Pl ato , ▁about ▁whom ▁little ▁is ▁known . ▁ ▁There ▁are ▁two ▁references ▁to ▁Le od am as ▁in ▁Pro clus ' s ▁Comment ary ▁on ▁Eu cl id : ▁ ▁" At ▁this ▁time ▁[ Pl ato ' s ▁time ] ▁also ▁lived ▁Le od am as ▁of ▁Th as os , ▁Arch yt as ▁of ▁Tar ent um , ▁and ▁The a et et us ▁of ▁Ath ens , ▁by ▁whom ▁the ▁▁▁▁ ▁the or ems ▁[ of ▁geometry ] ▁were ▁increased ▁in ▁number ▁and ▁brought ▁into ▁a ▁more ▁scientific ▁arrangement . ▁ ▁Young er ▁than ▁Le od am as ▁was ▁▁▁▁ ▁Ne oc l ides ▁and ▁his ▁pup il ▁Leon , ▁who ▁added ▁many ▁discover ies ." ▁ ▁" Pl ato , ▁it ▁is ▁said , ▁taught ▁this ▁method ▁[ analysis ] ▁to ▁Le od am as , ▁who ▁is ▁also ▁reported ▁to ▁have ▁made ▁many ▁discover ies ▁in ▁geometry ▁by ▁▁▁▁ ▁means ▁of ▁it ." ▁ ▁and ▁one ▁in ▁Di ogen es ▁La ë r ti us ' ▁L ives ▁and ▁Op in ions ▁of ▁E min ent ▁Philosoph ers , ▁Book ▁ 3 ▁( Pl ato ): ▁ ▁" He ▁[ Pl ato