Mathematics 625 Spring, 1997

PDE Classifications

Partial differential equations can be classified according to the type of subsidiary conditions that must be imposed to produce a well posed problem. Consider a general linear second order PDE in two independent variables of the form

where the coefficients are functions of x and y. Then it is elliptic, hyperbolic, or parabolic if the determinant is positive, negative, or zero. Note that this classification depends on the region of the (x,y)-plane under consideration.

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Craig C. Douglas