The output of DSolve[D[f[x, t], t] == D[f[x,t],{x, 2}], f[x,t], {x,t}]
is just a copy of the input — does this mean DSolve couldn’t find an answer?
There are fairly trivial solutions, e.g. f(x,t) = e^(x+t)
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The output of DSolve[D[f[x, t], t] == D[f[x,t],{x, 2}], f[x,t], {x,t}]
is just a copy of the input — does this mean DSolve couldn’t find an answer?
There are fairly trivial solutions, e.g. f(x,t) = e^(x+t)