1.

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

A. \(\frac{∂^2 z}{∂η^2}+⋯=0 \)
B. \(\frac{∂^2 z}{∂ζ∂η}+⋯=0\)
C. \(\frac{∂^2 z}{∂α^2}+\frac{∂^2 z}{∂β^2}…=0\)
D. \(\frac{∂^2 z}{∂ζ^2}+⋯=0\)
Answer» B. \(\frac{∂^2 z}{∂ζ∂η}+⋯=0\)


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