Bienaymé-Chebyshev Inequality/Historical Note
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Historical Note on Bienaymé-Chebyshev Inequality
The result now known as the Bienaymé-Chebyshev Inequality was first formulated, without proof, by Irénée-Jules Bienaymé in $1853$.
The proof was provided by his friend and colleague Pafnuty Lvovich Chebyshev in $1867$.
Chebyshev's student Andrey Andreyevich Markov provided another proof in his $1884$ Ph.D. thesis.