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I don't have enough information from the context provided to write an accurate overview. The context only indicates that Q176659 refers to a Russian mathematician, but doesn't specify which mathematician it is, their accomplishments, or why they matter. I would need additional details to create an accurate two-sentence overview.
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Andrey Andreyevich Markov (14 June [O.S. 2 June] 1856 – 20 July 1922) was a Russian mathematician celebrated for his pioneering work in stochastic processes. He extended foundational results—such as the law of large numbers and the central limit theorem—to sequences of dependent random variables, laying the groundwork for what would become known as Markov chains. To illustrate his methods, he analyzed the distribution of vowels and consonants in Alexander Pushkin's Eugene Onegin, treating letters purely as abstract categories and stripping away any poetic or semantic content.
He was also a strong chess player.
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1856 births1922 deaths19th-century mathematicians from the Russian Empire19th-century statisticians20th-century Russian mathematicians20th-century statisticiansFormer Eastern Orthodox Christians from RussiaFull Members of the Russian Academy of Sciences (1917–1925)Full members of the Saint Petersburg Academy of SciencesPeople from RyazanProbability theorists