= Lowell Schoenfeld
{c}
Lowell Schoenfeld coauthored quantitative estimates in <analytic number theory> with <J. Barkley Rosser>. Their paper gives explicit bounds for functions of <prime numbers>, including an upper bound for $n/\varphi(n)$. Careful constants, exceptional cases and validity ranges distinguish such a result from a purely asymptotic statement.<Approximate formulas for some functions of prime numbers by J. Barkley Rosser and Lowell Schoenfeld>[Theorem 15 and Section 9]{ref}
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