In writing a paper, I am using the notation $\beta_n\le O(n^{-3 })$ to mean any sequence converging to zero as fast as or even faster that $1/n^3$. Is this a standard notation?, and has anyone seen this in textbooks or papers?
Thanks in advance
2026-03-26 01:34:24.1774488864
Notation f(x)<=O(g(x))
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