Eugène Charles Catalan
Eugène Charles Catalan ( 30 May 1814 – 14 February 1894 ) was a French and Belgian mathematician who worked on continued fractions , descriptive geometry , number theory and combinatorics . 
<triplet> Eugène Charles Catalan <subj> 30 May 1814 <obj> date of birth <subj> 14 February 1894 <obj> date of death <subj> number theory <obj> field of work <subj> combinatorics <obj> field of work