= Classification of second order partial differential equations into elliptic, parabolic and hyperbolic
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>.
Bibliography:
* https://math.stackexchange.com/questions/1090299/why-are-elliptic-parabolic-hyperbolic-pdes-called-elliptic-parabolic-hyperb
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