Ivan Vladislavovich Sleshinsky[1] or Jan Śleszyński[1][2][3] (Russian: Иван Владиславович Слешинский) (23 July 1854 – 9 March 1931) was a Polish-Russian mathematician.
He was born in Lysianka, Russian Empire to Polish parents.
Śleszyński's main work was on continued fractions, least squares and axiomatic proof theory based on mathematical logic.
He and Alfred Pringsheim, working separately, proved what is now called the Śleszyński–Pringsheim theorem.
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