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Some explicit estimates for the error term in the prime number theorem

By combining and improving recent techniques and results, we provide explicit estimates for the error terms $|π(x)-\text{li}(x)|$, $|θ(x)-x|$ and $|ψ(x)-x|$ appearing in the prime number theorem. For example, we show for all $x\geq 2$ that $|ψ(x)-x|\leq 9.39x(\log x)^{1.515}\exp(-0.8274\sqrt{\log x})$. Our estimates rely heavily on explicit zero-free regions and zero-density estimates for the Riemann zeta-function, and improve on existing bounds for prime-counting functions for large values of $x$.