Write the explicit dependance of xi on the original


Consider the transport equation ut + 4ux = 0. On the grid below sketch seven different characteristic curves for the equation. Let ξ be the characteristic variable. Write the explicit dependance of ξ on the original variables t,x. Set v(t, ξ) = u(t, x), and use the chain rule to compute ux and uy in terms of v, vt, vξ, etc. Verify that the function v(t, ξ) satisfies the equation vt = 0.

1874_Seven different characteristic curves.jpg

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Mathematics: Write the explicit dependance of xi on the original
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