érieure ▁in ▁Paris . ▁In ▁ 1 9 3 8 ▁he ▁obtained ▁his ▁di pl oma , ▁major ing ▁in ▁number ▁theory . ▁Con sequently ▁he ▁was ▁a ▁professor ▁in ▁Str as bourg . ▁From ▁ 1 9 5 4 ▁on , ▁and ▁for ▁ 2 2 ▁years , ▁he ▁was ▁the ▁director ▁of ▁the ▁department ▁of ▁pure ▁mathematics ▁at ▁the ▁University ▁of ▁Gren o ble . ▁ ▁Mathemat ical ▁work ▁▁ ▁He ▁worked ▁on ▁Di oph antine ▁approximation ▁and ▁geometry ▁of ▁numbers , ▁where ▁he ▁used ▁both ▁classical ▁and ▁p - adic ▁analyt ic ▁methods . ▁He ▁introduced ▁the ▁Ch ab aut y ▁topology ▁to ▁general ise ▁Mah ler ' s ▁compact ness ▁theorem ▁from ▁E uclidean ▁l att ices ▁to ▁more ▁general ▁discrete ▁sub groups . ▁ ▁Notes ▁and ▁References ▁ ▁Category : 2 0 th - century ▁mathemat icians ▁Category : F rench ▁mathemat icians ▁Category : F rench ▁people ▁of ▁colonial ▁Al ger ia ▁Category : 1 9 1 0 ▁birth s ▁Category : 1 9 9 0 ▁death s <0x0A> </s> ▁The ▁Jimmy ▁& ▁Ros al yn n ▁Carter ▁Work ▁Project ▁- ▁formerly ▁the ▁Jimmy ▁Carter ▁Work ▁Project ▁( J C WP ) ▁- ▁is ▁an ▁annual ▁home ▁building ▁bl itz ▁organized ▁by ▁Hab itat ▁for ▁Human ity ▁International ▁and ▁its ▁affili ates . ▁It ▁generally ▁takes ▁place ▁in ▁the ▁United ▁States ▁one ▁year , ▁and ▁an ▁international ▁location ▁the ▁next . ▁ ▁President ▁Jimmy ▁Carter ▁and ▁Ros al yn n ▁Carter ▁helped ▁Hab itat ▁volunte ers ▁renov