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Nadusha1986 [10]
3 years ago
7

For each initial value problem, determine whether Picard's Theorem can be used to show the existence of a unique solution in an

open interval containing t = 0. Justify your answer.
(a) y' = ty4/3, y(0) = 0
(b) y' = tył/3, y(0) = 0
(c) y' = tył/3, y(0) = 1
Mathematics
1 answer:
Alinara [238K]3 years ago
6 0

Answer:

Part a: f , \, f_y is continuous at the initial value (0,0) so due to Picardi theorem there exists an interval such that the IVP has a unique solution.

Part b: f_y is not continuous at the initial value (0,0) so due to Picardi theorem there does not exist an interval such that the IVP has a unique solution.

part c: f , \, f_y is continuous at the initial value (0,1) so due to Picardi theorem there exists an interval such that the IVP has a unique solution.

Step-by-step explanation:

Part a

as y^{' }=ty^{4/3}

Let

f(t,y)=ty^{4/3}

Now derivative wrt y is given as

f_y=\frac{4}{3}ty^{1/3}

Finding continuity via the initial value

f is continuous on R^2 also f_y is also continuous on R^2

Also

f , \, f_y is continuous at the initial value (0,0) so due to Picardi theorem there exists an interval such that the IVP has a unique solution.

Part b

as y^{' }=ty^{1/3}

Let

f(t,y)=ty^{1/3}

Now derivative wrt y is given as

f_y=\frac{1}{3}ty^{-2/3}

Finding continuity via the initial value

f is continuous on R^2 also f_y is also continuous on R^2

Also

f_y is not continuous at the initial value (0,0) so due to Picardi theorem there does not exist an interval such that the IVP has a unique solution.

Part c

as y^{' }=ty^{1/3}

Let

f(t,y)=ty^{1/3}

Now derivative wrt y is given as

f_y=\frac{1}{3}ty^{-2/3}

Finding continuity via the initial value

f is continuous on R^2 also f_y is also continuous on R^2 when y\neq 0

Also

f , \, f_y is continuous at the initial value (0,1) so due to Picardi theorem there exists an interval such that the IVP has a unique solution.

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==================================================

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