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The Paris-Saclay Faculty of Sciences or Orsay Faculty of Sciences, in French : Faculté des sciences d'Orsay, is the mathematics and physics school within Paris-Saclay University, founded in 1956. It offers undergraduate and graduate degrees in mathematics, physics and chemistry (though its undergraduates are officially enrolled in Paris-Saclay Undergraduate School).
Previously the Paris-Sud Faculty of Sciences, the School assumed its current structure in 2019. Christine Paulin-Mohring has been the School's dean since 2016.Recent investments as part of the Paris-Saclay cluster have enlarged the School's faculty and upgraded its facilities. In July 2020, Paris-Saclay was ranked first worldwide for Mathematics by Academic Ranking of World Universities (ARWU) and 9th worldwide for Physics (1st in Europe). The Faculty has produced numerous research discoveries and many distinguished alumni and professors.