Uniqueness of conservative solutions for the Hunter-Saxton equation

We show that the Hunter-Saxton equation $u_t+uu_x=\frac14\big(\int_{-\infty}^x dμ(t,z)- \int^{\infty}_x dμ(t,z)\big)$ and $μ_t+(uμ)_x=0$ has a unique, global, weak, and conservative solution $(u,μ)$ of the Cauchy problem on the line.

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