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Nov 24th, 2017
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  1. ClearAll[u,u0,t,z,L0];
  2. pde=D[u[z,t],t]== D[u[z,t],{z,2}];
  3. bc={u[0,t]==0,u[L0,t]==0}
  4. ic=u[z,0]==u0
  5. NumericQ[L0]=True;
  6. sol=DSolve[{pde,bc,ic},u[z,t],{z,t}]
  7.  
  8. % /. L0 -> 2
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