A Java library providing numerical solvers, interpolation, and ODE integration utilities: Brent-Dekker and Newton-Raphson scalar root-finders, multivariate Newton-Raphson system solver with Jacobian support, Armijo backtracking line search, monotonicity-preserving cubic Hermite (PCHIP) interpolation, and fixed-step ODE integrators (Euler and Runge-Kutta 4). All classes are immutable and thread-safe.