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Math
Posted about 1 month ago
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Determine the stability of the critical point (0,0)(0,0) for the system of differential equations dotx=x2ydot{x} = x^2 - y, doty=y2xdot{y} = y^2 - x.
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Answer from Sia
Posted about 1 month ago
Solution by Steps
step 1
We start with the system of differential equations: dotx=x2ydot{x} = x^2 - y, doty=y2xdot{y} = y^2 - x. We need to find the critical points by setting dotx=0dot{x} = 0 and doty=0dot{y} = 0. This gives us the equations: x2y=0x^2 - y = 0 and y2x=0y^2 - x = 0
step 2
Solving these equations simultaneously at the critical point (0,0)(0,0), we substitute x=0x = 0 and y=0y = 0: 020=00^2 - 0 = 0 and 020=00^2 - 0 = 0. Thus, (0,0)(0,0) is indeed a critical point
step 3
To determine the stability of the critical point, we analyze the Jacobian matrix of the system. The Jacobian matrix JJ is given by: J=(dotxxdotxydotyxdotyy)J = \begin{pmatrix} \frac{\partial dot{x}}{\partial x} & \frac{\partial dot{x}}{\partial y} \\ \frac{\partial dot{y}}{\partial x} & \frac{\partial dot{y}}{\partial y} \end{pmatrix}. Calculating the partial derivatives at (0,0)(0,0), we find: J(0,0)=(0110)J(0,0) = \begin{pmatrix} 0 & -1 \\ -1 & 0 \end{pmatrix}
step 4
The eigenvalues of the Jacobian matrix are found by solving the characteristic equation: det(JλI)=0det(J - \lambda I) = 0. This leads to the equation: λ2+1=0\lambda^2 + 1 = 0, giving us eigenvalues λ=i\lambda = i and λ=i\lambda = -i. Since the eigenvalues are purely imaginary, the critical point (0,0)(0,0) is a center and is stable
Answer
The critical point (0,0)(0,0) is stable and behaves like a center.
Key Concept
Stability of critical points in dynamical systems is determined by the eigenvalues of the Jacobian matrix.
Explanation
The eigenvalues being purely imaginary indicates that trajectories near the critical point will oscillate around it, confirming its stability.

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