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The statement that he is a French mathematician would benefit from a source. He was born in Brussels, i.e., outside France, from Italian parents. The French and German wikipedias award him Italian citizenship until 1972 and an American one afterwards. To call him French because he started his mathematical career is France could be misleading.--Lieven Smits (talk) 04:45, 13 September 2019 (UTC)[reply]
