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It’s a problem I encountered when answering this question and I think it’s worth starting a new question for it. Consider the following expressions: expr = Erfc[x/(2 Sqrt[t])] – E^(t + x) Erfc[Sqrt[t] + x/(2 Sqrt[t])]; texpr = E^(-Sqrt[s] x)/(s + s^(3/2)); texpr is the Laplace transform of expr when x > 0. This canRead more