3. Given solutions Y1(t) = (x1(t), yı(t)) and Y2(t) = (x2(t), y2(t)) to the system %3D dY a b AY, where A = dt we define the Wronskian of Y¡(t) and Y2(t) to be the function W(t) = x1(t)y2(t) – x2(t)y1(t). (a) Compute dW/dt. (b) Use the fact that Y1(t) and Y2(t) are solutions of the linear system to show that dW (a + d)W(t). %3D dt

Linear Algebra: A Modern Introduction
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ISBN:9781285463247
Author:David Poole
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Chapter4: Eigenvalues And Eigenvectors
Section4.6: Applications And The Perron-frobenius Theorem
Problem 69EQ: Let x=x(t) be a twice-differentiable function and consider the second order differential equation...
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3. Given solutions Y1(t) = (x1(t), y1(1)) and Y2(t) = (x2(t), y2(t)) to the system
dY
a b
са
AY,
where A =
dt
we define the Wronskian of Y (t) and Y2(t) to be the function
W(t) = x1(t)y2(t) - x2(1)y1(t).
(a) Compute dW/dt.
(b) Use the fact that Y1(t) and Y2(t) are solutions of the linear system to show that
dW
(a + d)W(t).
dt
Transcribed Image Text:3. Given solutions Y1(t) = (x1(t), y1(1)) and Y2(t) = (x2(t), y2(t)) to the system dY a b са AY, where A = dt we define the Wronskian of Y (t) and Y2(t) to be the function W(t) = x1(t)y2(t) - x2(1)y1(t). (a) Compute dW/dt. (b) Use the fact that Y1(t) and Y2(t) are solutions of the linear system to show that dW (a + d)W(t). dt
dW
(c) Find the general solution of the differential equation
3D (а + d)W().
dt
(d) Suppose that Y1(t) and Y2(t) are solutions to the system dY/dt = AY. Verify that if Y1(0) and
Y2(0) are linearly independent, then Y1(t) and Y2(t) are also linearly independent for every t.
Transcribed Image Text:dW (c) Find the general solution of the differential equation 3D (а + d)W(). dt (d) Suppose that Y1(t) and Y2(t) are solutions to the system dY/dt = AY. Verify that if Y1(0) and Y2(0) are linearly independent, then Y1(t) and Y2(t) are also linearly independent for every t.
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