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Cauchy differential equation

Prove d/dt(u(x(t),t))+tanh(x(t))(d/dx(u(x(t),t)))=0
limit as x tends to infinity of u(x,t)=0

has at most one solution.Explain why there is no boundary condition at x=0
and find a solution for the special case a(x(t))=sinh(x(t))

Solution Summary

This shows why a given differential equation has at most one solution.