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Question Number 163082 by HongKing last updated on 03/Jan/22

$$1.{\mathrm{u}}_{\mathbf{x}\mathbf{x}}-{2\mathrm{u}}_{\mathbf{x}\mathbf{y}}+{3\mathrm{u}}_{\mathbf{y}\mathbf{y}}-{\mathrm{u}}_{\mathbf{x}}=0$$$$2.{\mathrm{xu}}_{\mathbf{x}\mathbf{x}}+{2\mathrm{xu}}_{\mathbf{x}\mathbf{y}}+{3\mathrm{u}}_{\mathbf{y}\mathbf{y}}+{\mathrm{u}}_{\mathbf{y}}=0$$

Commented by mahdipoor last updated on 03/Jan/22

$$whatthemeaningof{u}_{x}or{u}_{xy}or...?$$

Commented by mr W last updated on 03/Jan/22

$$u_x=\frac{\partial u}{\partial x}$$$$u_y=\frac{\partial u}{\partial y}$$$$u_{xx}=\frac{{\partial }^{2}u}{\partial x^2}$$$$u_{xy}=\frac{{\partial }^{2}u}{\partial x\partial y}$$$$...$$

Commented by mahdipoor last updated on 03/Jan/22

$$thankserW$$

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