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Partial differential algebraic equation : ウィキペディア英語版
Partial differential algebraic equation
In mathematics a partial differential algebraic equation (PDAE) set is an incomplete system of partial differential equations that is closed with a set of algebraic equations.
== Definition ==
A general PDAE is defined as:
: 0 = \mathbf F \left( \mathbf x, \mathbf y, \frac, \frac, \ldots, \mathbf z \right),
where:
* F is a set of arbitrary functions;
* x is a set of independent variables;
* y is a set of dependent variables for which partial derivatives are defined; and
* z is a set of dependent variables for which no partial derivatives are defined.
The relationship between a PDAE and a partial differential equation (PDE) is analogous to the relationship between an ordinary differential equation (ODE) and a differential algebraic equation (DAE).
PDAEs of this general form are challenging to solve. Simplified forms are studied in more detail in the literature.〔Wagner, Y. 2000. "A further index concept for linear PDAEs of hyperbolic type," Mathematics and Computers in Simulation, v. 53, pp. 287–291.〕〔W. S. Martinson, P. I. Barton. (2002) "Index and characteristic analysis of linear PDAE systems," Siam Journal on Scientific Computing, v. 24, n. 3, pp. 905–923.〕〔Lucht, W.; Strehmel, K.. 1998. "Discretization based indices for semilinear partial differential algebraic equations," Applied Numerical Mathematics, v. 28, pp. 371–386.〕 Even as recently as 2000, the term "PDAE" has been handled as unfamiliar by those in related fields.〔Simeon, B.; Arnold, M.. 2000. "Coupling DAEs and PDEs for simulating the interaction of pantograph and catenary," Mathematical and Computer Modelling of Dynamical Systems, v. 6, pp. 129–144.〕

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