L-stability
Within mathematics regarding differential equations, L-stability is a special case of  A-stability, a property of Runge–Kutta methods for solving  ordinary differential equations. A method is L-stable if it is  A-stable and  as , where  is the stability function of the method (the stability function of a Runge–Kutta method is a rational function and thus the limit as  is the same as the limit as ). L-stable methods are in general very good at integrating stiff equations. References 
 . Numerical differential equations