2 6 : ▁ 2 6 th ▁ 1 9 2 8 : ▁ 4 th ▁ 1 9 3 0 : ▁ 1 5 th ▁ ▁References ▁ ▁Category : 1 9 0 4 ▁birth s ▁Category : 1 9 6 4 ▁death s ▁Category : Bel g ian ▁male ▁cycl ists ▁Category : T our ▁de ▁France ▁cycl ists ▁Category : S ports people ▁from ▁Ant werp ▁Category : Pe ople ▁from ▁Hob oken <0x0A> </s> ▁Lev ▁Abr am ov ich ▁T um ark in ▁( 1 4 ▁January ▁ 1 9 0 4 – 1 9 7 4 ) ▁was ▁a ▁Russian ▁math ematic ian . ▁He ▁was ▁de an ▁of ▁the ▁Fac ulty ▁of ▁Mechan ics ▁and ▁Mathemat ics ▁of ▁Moscow ▁State ▁University . ▁ ▁He ▁was ▁a ▁student ▁of ▁P avel ▁Aleks and rov . ▁ ▁He ▁attended ▁the ▁First ▁International ▁Top ological ▁Conference ▁in ▁Moscow , ▁ 1 9 3 5 ▁as ▁a ▁host ▁but ▁made ▁no ▁presentation . ▁ ▁References ▁ ▁Category : 1 9 0 4 ▁birth s ▁Category : 1 9 7 4 ▁death s <0x0A> </s> ▁Der ince ▁is ▁a ▁village ▁in ▁the ▁District ▁of ▁S ason , ▁Bat man ▁Province , ▁Turkey . ▁As ▁of ▁ 2 0 1 1 , ▁it ▁had ▁a ▁population ▁of ▁ 1 0 4 5 ▁ ▁people . ▁ ▁References ▁ ▁Category : Pop ulated ▁places ▁in ▁Bat man ▁Province ▁Category : S ason ▁District ▁Category : V ill ages ▁in ▁Turkey <0x0A> </s> ▁The ▁Ken