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By
Wikipedia, In mathematics, a hyperbolic partial differential equation is usually a second-order partial differential equation (PDE) of the form with
This definition is analogous to the definition of a planar hyperbola. The one-dimensional wave equation: is an example of a hyperbolic equation. The two-dimensional and three-dimensional wave equations also fall into the category of hyperbolic PDE. This type of second-order hyperbolic partial differential equation may be transformed to a hyperbolic system of first-order differential equations. Hyperbolic system of partial differential equationsConsider the following system of s first order partial differential equations for s unknown functions
Now define for each We say that the system ( * ) is hyperbolic if for all If the matrix A has distinct real eigenvalues, it follows that it's diagonalizable. In this case the system ( * ) is called strictly hyperbolic. Hyperbolic system and conservation lawsThere is a connection between a hyperbolic system and a conservation law. Consider a hyperbolic system of one partial differential equation for one unknown function Now u can be some quantity with a flux If u and which means that the time rate of change of u in the domain Ω is equal to the net flux of u through its boundary Γ. Since this is an equality, it can be concluded that u is conserved within Ω. See also
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Published in July 2009. Click here to read more articles related to aviation and space!
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