Cauchy problem

A Cauchy problem in mathematics asks for the solution of a partial differential equation that satisfies certain conditions that are given on a hypersurface in the domain. A Cauchy problem may involve initial or boundary values. It is named after Augustin-Louis Cauchy.

Formal statement

For a partial differential equation defined on $ℝ^{n + 1}$ and a smooth manifold $S \subset ℝ^{n + 1}$ of dimension $n$ ( $S$ is called the Cauchy surface), the Cauchy problem consists of finding the unknown functions $u_{1}, \dots, u_{N}$ of the differential equation with respect to the independent variables $t, x_{1}, \dots, x_{n}$ that satisfies $\begin{matrix} \frac{\partial^{n_{i}} u_{i}}{\partial t^{n_{i}}} = F_{i} (t, x_{1}, \dots, x_{n}, u_{1}, \dots, u_{N}, \dots, \frac{\partial^{k} u_{j}}{\partial t^{k_{0}} \partial x_{1}^{k_{1}} \dots \partial x_{n}^{k_{n}}}, \dots) \\ for i, j = 1, 2, \dots, N; k_{0} + k_{1} + \dots + k_{n} = k \leq n_{j}; k_{0} < n_{j} \end{matrix}$ subject to the condition, for some value $t = t_{0}$ ,

$\frac{\partial^{k} u_{i}}{\partial t^{k}} = ϕ_{i}^{(k)} (x_{1}, \dots, x_{n}) for k = 0, 1, 2, \dots, n_{i} - 1$

where $ϕ_{i}^{(k)} (x_{1}, \dots, x_{n})$ are given functions defined on the surface $S$ (collectively known as the Cauchy data of the problem). The derivative of order zero means that the function itself is specified.

Cauchy–Kowalevski theorem

The Cauchy–Kovalevskaya theorem, named in honor of Cauchy and Sofya Kovalevskaya, states: If all the functions $F_{i}$ are analytic in some neighborhood of the point $(t^{0}, x_{1}^{0}, x_{2}^{0}, \dots, ϕ_{j, k_{0}, k_{1}, \dots, k_{n}}^{0}, \dots)$ , and if all the functions $ϕ_{j}^{(k)}$ are analytic in some neighborhood of the point $(x_{1}^{0}, x_{2}^{0}, \dots, x_{n}^{0})$ , then the Cauchy problem has a unique analytic solution in some neighborhood of the point $(t^{0}, x_{1}^{0}, x_{2}^{0}, \dots, x_{n}^{0})$ .

References

↑ Hadamard, Jacques (1923). Lectures on Cauchy's Problem in Linear Partial Differential Equations. New Haven: Yale University Press. pp. 4–5. OCLC 1880147.
↑ Petrovsky, I. G. (1991) [1954]. Lectures on Partial Differential Equations. Translated by Shenitzer, A. (Dover ed.). New York: Interscience. p. 14. ISBN 0-486-66902-5.

External links

Cauchy problem at MathWorld.

[1] Hadamard, Jacques (1923). Lectures on Cauchy's Problem in Linear Partial Differential Equations. New Haven: Yale University Press. pp. 4–5. OCLC 1880147.

[2] Petrovsky, I. G. (1991) [1954]. Lectures on Partial Differential Equations. Translated by Shenitzer, A. (Dover ed.). New York: Interscience. p. 14. ISBN 0-486-66902-5.

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Cauchy problem

Formal statement

Cauchy–Kowalevski theorem

See also

References

Further reading

External links