Partial differential equations with laplas

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SUMMARY

The discussion focuses on solving the partial differential equation U'(x) = a²U''(t) using Laplace transforms, with the initial condition U(x,0) = 2. The initial step involves applying the Laplace transform, leading to the equation S*U(s) - 2 = a²(d²/dx²)U(s). The participant aims to manipulate this into a solvable differential equation form, ultimately suggesting the use of separation of variables to express U as the product of functions of x and t.

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  • Understanding of partial differential equations (PDEs)
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  • Experience with separation of variables technique
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Students and professionals in mathematics, engineering, and physics who are working with partial differential equations and seeking to enhance their problem-solving skills using Laplace transforms.

jd1828
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Homework Statement



Solve the partial differential equation using laplas transforms:

U`(x)=a^2*U``(t)

given U(x,0)=2


There are more initial conditions but i am just trying to get to the general solution

The Attempt at a Solution



First take laplas of the equation. Then I am trying to get it into a differential equation form that i know how to solve.

im not sure what method its called but I get

r^2 - s/(a^2)=0

Im not to sure if that is correct.
 
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I should add that after taking the laplas of the equation I get:

S*U(s)-2=a^2*(d^2/dx^2)U(s)
 
solve this using separation of variables in which you assume that u is

u(x,t) = X(x)T(t)

once you substitute this back int othe original equation you can separate that into two second order lienar DEs which you can solve easily.
 

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