numdiff 0.11.2

Numerical differentiation via forward-mode automatic differentiation and finite difference approximations.
Documentation 
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//! Constants used for numerical differentiation.

use std::sync::LazyLock;

/// Square root of the machine epsilon ($\sqrt{\varepsilon}$).
pub static SQRT_EPS: LazyLock<f64> = LazyLock::new(|| f64::EPSILON.sqrt());

/// Cube root of the machine epsilon ($\varepsilon^{1/3}$).
pub static CBRT_EPS: LazyLock<f64> = LazyLock::new(|| f64::EPSILON.cbrt());

/// Fourth root of the machine epsilon ($\varepsilon^{1/4}$).
pub static FOURTH_ROOT_EPS: LazyLock<f64> = LazyLock::new(|| f64::EPSILON.powf(0.25));