Exercise 3.7 Prove that there is a unique solution of the following nonlinear BVP when the constant A is sufficiently small, -u" +Asin u = f(x), u(0) = 0, u(1) = 0.

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Exercise 3.7 Prove that there is a unique solution of the following nonlinear BVP
when the constant A is sufficiently small,
-u" + A sin u = f(x),
u(0) = 0, u(1) = 0.
Here, f: [0, 1] → R is a given continuous function. Write out the first few iterates
of a uniformly convergent sequence of approximations, beginning with up = 0.
HINT. Reformulate the problem as a nonlinear integral equation.
Transcribed Image Text:Exercise 3.7 Prove that there is a unique solution of the following nonlinear BVP when the constant A is sufficiently small, -u" + A sin u = f(x), u(0) = 0, u(1) = 0. Here, f: [0, 1] → R is a given continuous function. Write out the first few iterates of a uniformly convergent sequence of approximations, beginning with up = 0. HINT. Reformulate the problem as a nonlinear integral equation.
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