Ciro Santilli
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Classification of second order partial differential equations into elliptic, parabolic and hyperbolic | 🗖 nosplit | ↑ parent "Differential equation" | 37, 4, 107

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One major application of this classification is that different boundary conditions are suitable for different types of partial differential equations as explained at: which boundary conditions lead to existence and uniqueness of a second order PDE.
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