Gianfranco Cimmino
Gianfranco Cimmino ( 12 March 1908 – 30 May 1989 ) was an Italian mathematician , working mathematical analysis , numerical analysis , and theory of elliptic partial differential equations: he is known for being the first mathematician generalizing in a weak sense the notion of boundary value in a boundary value problem , and for doing an influential work in numerical analysis . 
<triplet> Gianfranco Cimmino <subj> 12 March 1908 <obj> date of birth <subj> 30 May 1989 <obj> date of death