Exact Solutions > Linear Partial Differential Equations > Second-Order Elliptic Partial Differential Equations ## 3. Linear Elliptic Equations-
Δ
*w*= 0. Laplace equation. -
Δ
*w*+ Φ(**x**) = 0. Poisson equation. -
Δ
*w*+ λ*w*= −Φ(**x**). Helmholtz equation.
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