|                                                             | Academy of Mathematics and Systems Science, CAS
 Colloquia & Seminars
 
 
 |                                                              | Speaker: | 黎海彤,长春工业大学 
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 | Polygonal Approxmations              of Solutions of the Intial Value Problem for a Conservation Law (I)              (II) |                          | Time & Venue: 
 | 2021.08.12 09:30-11:30              思源楼S809 |                          | Abstract: 
 | In this talk, we consider the polygonal approxmations of solutions                of the intial value problem for a conservation law. The solution                which satisfies the condition proposed by Hopf is constructed in                the special case where $u_0(x)$ is a step function and $f(u)$ is                piecewise linear. For $u_0(x)$ a step function, a local solution                can be constructed as a superposition of solutions of the Riemann                problem. Furthermore, the local solution can be extended onto a                global solution. Then, we generalize the method to the 1D compressible                Euler equations with time-dependent damping trem $ -\frac{\mu}{(1+t)^\lambda}u                $. 
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