This package provides some numerical techniques that are useful for computing approximate results. This includes numerical integration and splines. The package {@link xxl.core.math.numerics.integration integration} realizes adaptive versions of the {@link xxl.core.math.numerics.integration.TrapezoidalRuleRealFunctionArea Trapezoidal Rule} and the {@link xxl.core.math.numerics.integration.SimpsonsRuleRealFunctionArea Simpson's Rule}. The package {@link xxl.core.math.numerics.splines splines} computes the cubic Bezier-Spline interpolate with the {@link xxl.core.math.numerics.splines.RB1CubicBezierSpline natural boundary condition} or the {@link xxl.core.math.numerics.splines.RB2CubicBezierSpline complete boundary condition}.