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I was trying to verify my hand solution for this PDE using Mathematica. Is a trick to help Mathematica obtain solution to $ u_{t}+u=u_{xx}$ with initial conditions $ u(x,0)=f(x)$ and boundary conditions $ u(0,t)=u(L,t)=0$ ? I tried changing $ L$ to $ 1$ , and tried using explicit $ f(x)$ , but Mathematica still can’tRead more