About Eugène Charles Catalan
Eugène Charles Catalan was a French and Belgian mathematician who worked on continued fractions, descriptive geometry, number theory and combinatorics. His notable contributions included discovering a periodic minimal surface in the space; stating the famous Catalan's conjecture, which was eventually proved in 2002; and introducing the Catalan numbers to solve a combinatorial problem. He introduced the Catalan numbers to solve a combinatorial problem (although these were actually discovered a century earlier by the astronomer Minggatu).
Biography source: Wikipedia. The profile adds birthday-specific historical context from the Celebs Birthday Today editorial database.