The Differential Equation $\frac { \partial ^ { 2 } u } { \partial x ^ { 2 } } + \frac { \partial ^ { 2 } u } { \partial y ^ { 2 } } = u$

question 4

Multiple Choice

The differential equation $\frac { \partial ^ { 2 } u } { \partial x ^ { 2 } } + \frac { \partial ^ { 2 } u } { \partial y ^ { 2 } } = u$ is

• A) first order, linear, homogeneous
• B) first order, linear, non-homogeneous
• C) second order, nonlinear
• D) second order, linear, homogeneous
• E) second order, linear, non-homogeneous

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