The Differential Equation Is Select All That Apply

question 19

Multiple Choice

The differential equation $\frac { \partial ^ { 2 } u } { \partial x ^ { 2 } } + \frac { \partial ^ { 2 } u } { \partial x \partial y } + \frac { \partial ^ { 2 } u } { \partial y ^ { 2 } } = u$ is Select all that apply.

• A) linear
• B) nonlinear
• C) hyperbolic
• D) elliptic
• E) parabolic

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