premise: Géraud Sénizergues (born 1957) is a French computer scientist at the University of Bordeaux. With Yuri Matiyasevich he obtained results about the Post correspondence problem. He won the 2002 Gödel Prize "for proving that equivalence of deterministic pushdown automata is decidable"
hypothesis: Yuri Matiyasevich is a computer scientist. 
reason: It is not entirely clear if Matiyasevish is a computer scientist. The system may have had difficulties because it is strongly implied Matiyasevish is a computer scientist.