pub const RK45_A2: f64 = 1.0 / 4.0;
pub const RK45_A3: f64 = 3.0 / 8.0;
pub const RK45_A4: f64 = 12.0 / 13.0;
pub const RK45_A5: f64 = 1.0;
pub const RK45_A6: f64 = 0.5;
pub const RK45_B21: f64 = 1.0 / 4.0;
pub const RK45_B31: f64 = 3.0 / 32.0;
pub const RK45_B32: f64 = 9.0 / 32.0;
pub const RK45_B41: f64 = 1932.0 / 2197.0;
pub const RK45_B42: f64 = -7200.0 / 2197.0;
pub const RK45_B43: f64 = 7296.0 / 2197.0;
pub const RK45_B51: f64 = 439.0 / 216.0;
pub const RK45_B52: f64 = -8.0;
pub const RK45_B53: f64 = 3680.0 / 513.0;
pub const RK45_B54: f64 = -845.0 / 4104.0;
pub const RK45_B61: f64 = -8.0 / 27.0;
pub const RK45_B62: f64 = 2.0;
pub const RK45_B63: f64 = -3544.0 / 2565.0;
pub const RK45_B64: f64 = 1859.0 / 4104.0;
pub const RK45_B65: f64 = -11.0 / 40.0;
pub const RK45_C1: f64 = 16.0 / 135.0;
pub const RK45_C3: f64 = 6656.0 / 12825.0;
pub const RK45_C4: f64 = 28561.0 / 56430.0;
pub const RK45_C5: f64 = -9.0 / 50.0;
pub const RK45_C6: f64 = 2.0 / 55.0;
pub const RK45_D1: f64 = 25.0 / 216.0;
pub const RK45_D3: f64 = 1408.0 / 2565.0;
pub const RK45_D4: f64 = 2197.0 / 4104.0;
pub const RK45_D5: f64 = -1.0 / 5.0;
pub const ADAMS_BASHFORTH_4: [f64; 4] = [55.0 / 24.0, -59.0 / 24.0, 37.0 / 24.0, -9.0 / 24.0];