Mathematical Constants

First of all, the constants require the header <numbers> and the namespace std::numbers. The following table gives you an overview.

Mathematical constant	Description
std::numbers::e	$e$
std::numbers::log2e	$log$2 $e$
std::numbers::log10e	$log$10 $e$
std::numbers::pi	$π$
std::numbers::inv_pi	$$$1/π$
std::numbers::inv_sqrtpi	1/√π
std::numbers::ln2	$ln 2$
std::numbers::ln10	$ln 10$
std::numbers::sqrt2	$\sqrt{2}$
std::numbers::sqrt3	$\sqrt{3}$
std::numbers::inv_sqrt3	$\frac{1}{\sqrt{3}}$
std::numbers::egamma	Euler-Mascheroni constant
std::numbers::phi	$φ$