9
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Reported to Wolfram with CASE number 4028951


on 11.3,

ClearAll[u,x,t];
eqn=D[u[x,t],t]+u[x,t]*D[u[x,t],x]==0;
bc=u[0,t]==0;
ic=u[x,0]==x;
sol=DSolve[{eqn,bc,ic},u[x,t],x,t]

Mathematica graphics

What does, terms that have

     DSolve`DsolveLaplaceTransformDump`

mean in the solution? It looks like DSolve starting using the Laplace method to solve the above PDE. But is the above answer meant to be the final answer, or did DSolve gave up in the middle and these Dump messages are left there?

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  • 1
    $\begingroup$ It's a context that's used by internal functions. Usually, the answer is rewritten in terms of user variables. Happens on 11.2, too. I don't think it should happen. $\endgroup$ – Michael E2 Mar 12 '18 at 13:54
  • 5
    $\begingroup$ That's a bug, please report it. The Dump context should never leak. $\endgroup$ – user21 Mar 12 '18 at 13:56

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