Moment Inequality for the Martingale Square Function
Adam Osękowski (2013)
Bulletin of the Polish Academy of Sciences. Mathematics
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Consider the sequence of positive numbers defined by C₁ = 1 and , n = 1,2,.... Let M be a real-valued martingale and let S(M) denote its square function. We establish the bound |Mₙ|≤ Cₙ Sₙ(M), n=1,2,..., and show that for each n, the constant Cₙ is the best possible.