function dx = vanderPolEqMu2(x,u)
% vanderPolEqMu2 - system dynamics for the Van-der-Pol oscillator with
%                  increased stiffness (see Sec. 3.1 in [1])
%
% Syntax:
%    dx = vanderPolEqMu2(x,u)
%
% Inputs:
%    x - state vector
%    u - input vector
%
% Outputs:
%    dx - time-derivate of the system state
% 
% References:
%    [1] F. Immler, “ARCH-COMP19 Category Report: Continuous and Hybrid 
%        Systems with Nonlinear Dynamics", 2019

% Authors:       Matthias Althoff
% Written:       22-May-2020
% Last update:   ---
% Last revision: ---

% ------------------------------ BEGIN CODE -------------------------------

mu=2;

dx(1,1)=x(2);
dx(2,1)=mu*(1-x(1)^2)*x(2)-x(1)+u(1);
    
end

% ------------------------------ END OF CODE ------------------------------
