Solve the following initial value problem for u(x, ) on a semi-infinite interval, using a Greens

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Solve the following initial value problem for u(x, τ ) on a semi-infinite interval, using a Green’s function:

a2u on x > 0, t > 0, au ax2 *


with
u(x, 0) = u0(x) for x > 0, u(0, τ ) = 0 for τ > 0.

Define v(x, τ) as

v(x, τ ) = u(x, τ) if x > 0,
v(x, τ ) = −u(−x, τ) if x < 0.

Then we can show that v(0, τ ) = 0 and

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