Classification of second order partial differential equations into elliptic, parabolic and hyperbolic
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Classification of second order partial differential equations into elliptic, parabolic and hyperbolic by 
Ciro Santilli 34 Updated 2024-12-15 +Created 1970-01-01
Ciro Santilli 34 Updated 2024-12-15 +Created 1970-01-01One 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.