= J. Barkley Rosser
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J. Barkley Rosser coauthored explicit estimates for prime-related functions with <Lowell Schoenfeld>. Their bounds include the <Rosser–Schoenfeld totient bound>, controlling $n/\varphi(n)$ through logarithmic expressions with stated numerical constants and ranges. Explicit inequalities make number-theoretic estimates usable at finite values, where an asymptotic equivalence alone may give insufficient error control.<Approximate formulas for some functions of prime numbers by J. Barkley Rosser and Lowell Schoenfeld>[Theorem 15, equations (3.41)–(3.42)]{ref}
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