How can you solve the PDE using analytical techniques and LaTex code?

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SUMMARY

The discussion focuses on solving the partial differential equation (PDE) represented by the equation \(\frac{\partial U}{\partial t} + ax\frac{\partial U}{\partial x} + b\frac{\partial^2 U}{\partial x^2} = 0\) using analytical techniques and LaTeX code. The solution involves transforming the PDE into a form that utilizes the integral representation \(U(t,x)=\int_{-\infty}^\infty F(x,\tau)e^{it\tau}\,d\tau\). The resulting function \(F(x,\tau)\) is expressed in terms of Kummer functions, specifically \(KummerM\) and \(KummerU\), leading to the general solution \(U(t,x)=xe^{-\frac{ax^2}{2b}}\int_{-\infty}^\infty [H1(\tau)KummerM(-\frac{-2a+i\tau}{2a},\frac{3}{2},\frac{ax^2}{2b})+H2(\tau)KummerU(-\frac{-2a+i\tau}{2a},\frac{3}{2},\frac{ax^2}{2b})]e^{it\tau}\,d\tau\), where \(H1\) and \(H2\) are arbitrary functions.

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Geoffrey
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LaTex Code: \frac{\partial U}{\partial t} + ax\frac{\partial U}{\partial x} + b\frac{\partial^2 U}{\partial x^2} = 0


Can someone please tell me how to solve this PDE?

Thanks,
Geoff
 
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Assuming that

U(t,x)=\int_{-\infty}^\infty F(x,\tau)e^{it\tau}\,d\tau

we come to

-ib\frac{\partial^2 F(x,\tau)}{\partial x^2}-iax\frac{\partial F(x,\tau)}{\partial x}+\tau F(x,\tau)=0

which solution is as follows

F(x,\tau) = x[H1(\tau)KummerM(-\frac{-2a+i\tau}{2a},\frac{3}{2},\frac{ax^2}{2b})+H2(\tau)KummerU(-\frac{-2a+i\tau}{2a},\frac{3}{2},\frac{ax^2}{2b})]e^{-\frac{ax^2}{2b}}

so the general solution to your PDE is

U(t,x)=xe^{-\frac{ax^2}{2b}}\int_{-\infty}^\infty [H1(\tau)KummerM(-\frac{-2a+i\tau}{2a},\frac{3}{2},\frac{ax^2}{2b})+H2(\tau)KummerU(-\frac{-2a+i\tau}{2a},\frac{3}{2},\frac{ax^2}{2b})]e^{it\tau}\,d\tau

where H1 and H2 are arbitrary functions.
 

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