Question

State whether the following statement are true or false. Justify your answer with the help of a short proof or a counter-example.

i) The initial value problem

\frac{dy}{dx}=x^2+y^2,y(0)0

has a unique solution in some interval of the form -h<x<h.

ii) The orthogonal trajectories of all the parabolas with vertices at the origin and foci on the

x-axis is x^2+2y^2=c^.

iii) The normal form of the differential equation

y^{''}-4xy'+(4x^2-1)y=-3ex^2 sin 2x is \frac{d^2v}{dx} +v=-3sin2x,

where v=ye^{-x2}.

iv The solution of the pde \frac{\partial z}{\partial x}+\frac{\partial z}{\partial y}=z^2  is z=[y+f(x-y)].

11 Mar 2024
Answer :
Word Count : 466
Let's address each statement one by one: ### i) The initial value problem: \[ \frac{dy}{dx} = x^2 + y^2, \quad y(0) = 0 \] This statement asks whether there exists a unique solution to this initial value problem in some interval. Answer: False. The differential equation \(\frac{dy}{dx} = x^2 + y^2\) does not satisfy the conditions for the existence and uniqueness of a solution according to the Picard-Lindelöf theorem (which is based on the Lipschitz continuity of the function with respect to \(y\)). Here, \(f(x, y) = x^2 + y^2\) is not Lipschitz continuous in \(y\) because it grows quadratically in \(y\), which violates the condition for uniqueness. Therefore, this problem may have multiple solutions (or ______ ___ ____ _________ _____ _______ _________.
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