Dedicated to memory of Professor ROBERT JANIN

Professor Robert JANIN was a former teacher in Poitiers (1988-1998); he died in October 2016. His speciality was Optimization Theory and Theory of Control. He obtained his thesis in 1974, at the University of PARIS VI, under the supervision of Professor Pallu de la Barrière. Then, he was hired as a researcher IRIA (nowadays INRIA) where he stayed there from 1967 to 1972 and then was appointed as a researcher at C.N.R.S. (National Center for Scientific Research in France) from 1972 to 1979. During that period, he spent two years (1976-1978) in Africa, in Togo more precisely. He applied to a full professorship position at University CUAG (Centre Universitaire AntillesGuyane) in 1979, where he spent nine years before pursuing his career