abstract:In combinatorial mathematics, the Catalan numbers form a sequence of natural numbers that occur in various counting problems, often involving recursively defined objects. They are named after the Belgian mathematician Eugène Charles Catalan (1814–1894).
Ibrahimovic, who will wear the number nine shirt, has made little secret of his desire to join the Catalan club and told Barca TV on Wednesday a deal with Inter president Massimo Moratti was key to the move.