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Which of the following represents the canonical form of a second order parabolic PDE?

Which of the following represents the canonical form of a second order parabolic PDE? Correct Answer \(\frac{∂^2 z}{∂η^2}+⋯=0 \)

A second order linear partial differential equation can be reduced to so-called canonical form by an appropriate change of variables ξ = ξ(x, y), η = η(x, y).

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