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Using methods of Chasles, with Schröder's logical calculus as a model, he set up a system to solve such problems, he called it the principal of conservation of the number . Hilbert, in 1900, asked for a proof, which was given by Severi in 1912. Some remarkable counting results of Schubert were neglected for many years for their lack of rigour but recently many of them have been confirmed.
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