Let λ ∈ R be a parameter. We

Answered question

2022-02-16

Let λ ∈ R be a parameter. We consider the ODE with conditions to the limits. y + λy = 0, y(0)= 0, y(1)=0 Explain why the existence and uniqueness theorem does not apply.

Answer & Explanation

nick1337

nick1337

Expert2023-04-23Added 777 answers

The given ODE is y+λy=0, with initial conditions y(0)=0 and y(1)=0.

To apply the existence and uniqueness theorem for ODEs, the equation must be in the form of y'=f(x,y) with continuous partial derivatives of f(x, y) with respect to y in some rectangular region containing the initial point.

In this case, we have y'+λy=0, which can be written as y'=-λy. However, the function f(x,y)=-λy does not have continuous partial derivatives with respect to y in the entire xy-plane. Therefore, the existence and uniqueness theorem does not apply to this ODE.

Moreover, we can solve this ODE using separation of variables.

y'+λy=0

y'=-λy

Integrating both sides with respect to x, we get:

dyy=-λdx

ln|y|=-λx+C

Solving for y, we get:

y=Ce-λx
Using the initial condition y(0)=0, we get:

0=Ce-λ0

0=C

Thus, the solution to the ODE with the given initial conditions is y=0.

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