(a) If the action is A[u]= (1 2uxut +u3 x 1 2u2xx)dxdt, nd
Chapter 14, Problem 23(choose chapter or problem)
(a) If the action is A[u]= (1 2uxut +u3 x 1 2u2xx)dxdt, nd the Euler-Lagrange equation. (b) If v =ux, show that v satises the KdV equation.
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