By Professor Dr. Dietrich Stauffer, Professor Dr. Friedrich W. Hehl, Dipl.-Phys. Volker Winkelmann, Professor Dr. John G. Zabolitzky (auth.)

This article relies at the authors' large event in instructing the applying of pcs to physics. It takes the reader from the introductory simulation of classical mechanical difficulties (part one) to present learn in statistical physics. The Ising version, mobile automata, percolation, Eden clusters and the Kauffman version are provided with workouts and courses for hands-on use with the purpose of allowing and inspiring the scholar to put in writing her/his personal courses. The 3rd half provides a close path into algebraic formulation manipulation utilizing the pc algebra approach lessen, back with various examples and routines. those "lectures for newbies" don't require any past wisdom of laptop languages, yet a quick advent to FORTRAN and simple are available within the appendix.

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**Sample text**

We will assume that there exists a set of frequencies w - the eigenfrequencies of the string - and that the solution u(x,t) can be written as a superposition of some corresponding eigenfunctions. The coefficients of this superposition will depend upon time and express the variation of the motion in time. Mathematically, this must be a valid approach since the operator 82/ 8r&2 is a hermitean operator. It therefore has a complete orthonormal system of eigenfunctions, and it is nothing but a change of representation to transform from u(r&, t) to u(w, t): U(r&,t) = I>w(r&)u(w,t).

P (74) We may multiply this equation by p l / 2 to get (75) It is seen that by means of this transformation we obtain a symmetric matrix, which is highly desirable since the eigenvalue/eigenvector problem is computationally much easier and very good algorithms exist to solve symmetric problems. For non-symmetric real matrices, we would have to face the problem that eigenvalues as well as eigenvectors could become complex. The above analysis shows that for the present case that cannot occur; however, any numerical routine used to do the eigenvalue/eigenvector calculation for non-symmetric matrices could not know about this, and therefore numerical errors might produce non-real results.

Final remark: The method of solution chosen for the present problem (solving the wave equation) was deliberately tailored to closely parallel the solution of problems in quantum mechanics. The Schrodinger equation may be treated by rather similar methods, and all the various techniques and manipulations employed here are common to calculations on quantum -mechanical systems. 8 Literature 1. FORTRAN 77 programming language: any of a very large number of books will do. 2. UNIX operating system: Mark G.