To classify: The partial differential equation ∂ 2 u ∂ x 2 + 2 ∂ 2 u ∂ x ∂ y + ∂ 2 u ∂ 2 y + ∂ u ∂ x − 6 ∂ u ∂ y = 0 .

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Chapter 13.1, Problem 23E

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To classify: The partial differential equation ∂2u∂x2+2∂2u∂x∂y+∂2u∂2y+∂u∂x−6∂u∂y=0.

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