We explore in this chapter questions of existence and uniqueness for solutions to stochastic differential equations and offer a study of their properties. This endeavor is really a study of diffusion processes. Loosely speaking, the term diffusion is attributed to a Markov process which has continuous sample paths and can be characterized in terms of its infinitesimal generator.

Stochastic Differential Equations

Most numerical integration techniques consist of approximating the integrand by a polynomial in a region or regions and then integrating the polynomial exactly. Often a complicated integrand can be factored into a non-negative ''weight'' function and another function better approximated by a polynomial, thus $\int_{a}^{b} g(t)dt = \int_{a}^{b} \omega (t)f(t)dt \approx \sum_{i=1}^{N} w_i f(t_i)$. Hopefully, the quadrature rule ${\{w_j, t_j\}}_{j=1}^{N}$ corresponding to the weight function $\omega$(t) is available in tabulated form, but more likely it is not. We present here two algorithms for generating the Gaussian quadrature rule defined by the weight function when: a) the three term recurrence relation is known for the orthogonal polynomials generated by $\omega$(t), and b) the moments of the weight function are known or can be calculated.

Calculation of Gauss quadrature rules.

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Linear And Nonlinear Programming

Lectures on Cauchy’s Problem in Linear Partial Differential Equations. By J. Hadamard. Pp. viii+316. 15s.net. 1923. (Per Oxford University Press.)

Preface 1. The approximation problem and existence of best approximations 2. The uniqueness of best approximations 3. Approximation operators and some approximating functions 4. Polynomial interpolation 5. Divided differences 6. The uniform convergence of polynomial approximations 7. The theory of minimax approximation 8. The exchange algorithm 9. The convergence of the exchange algorithm 10. Rational approximation by the exchange algorithm 11. Least squares approximation 12. Properties of orthogonal polynomials 13. Approximation of periodic functions 14. The theory of best L1 approximation 15. An example of L1 approximation and the discrete case 16. The order of convergence of polynomial approximations 17. The uniform boundedness theorem 18. Interpolation by piecewise polynomials 19. B-splines 20. Convergence properties of spline approximations 21. Knot positions and the calculation of spline approximations 22. The Peano kernel theorem 23. Natural and perfect splines 24. Optimal interpolation Appendices Index.

Approximation theory and methods, by M. J. D. Powell. Pp 339. £25 (hardcover), £8·50 (paperback). 1981. ISBN 0-521-22472-1/29514-9 (Cambridge University Press)

Taylor polynomial solution of high-order nonlinear Volterra-Fredholm integro-differential equations

Numerical solution of linear Fredholm integral equation by using hybrid Taylor and Block-Pulse functions

Computational method based on Bernstein operational matrices for nonlinear Volterra–Fredholm–Hammerstein integral equations

A new approach to the numerical solution of Volterra integral equations by using Bernstein’s approximation

The main purpose of this article is to demonstrate the use of the Adomian decomposition method for mixed nonlinear Volterra-Fredholm integral equations. A bound is also given for the Adomian decomposition series. Finally, numerical examples are presented to illustrate the implementation and accuracy of the decomposition method.

Khosrow Maleknejad

Papers

Taylor polynomial solution of high-order nonlinear Volterra-Fredholm integro-differential equations

Numerical solution of linear Fredholm integral equation by using hybrid Taylor and Block-Pulse functions

Computational method based on Bernstein operational matrices for nonlinear Volterra–Fredholm–Hammerstein integral equations

A new approach to the numerical solution of Volterra integral equations by using Bernstein’s approximation

A new computational method for Volterra-Fredholm integral equations