Mathematica Journal

  1. https://doi.org/10.3888/tmj.21-1 A comprehensive discussion is presented of the closed-form solutions for the responses of single-degree-of-freedom systems subject to swept-frequency harmonic excitation. The closed-form solutions for linear and octave swept-frequency excitation are presented and these are compared to results obtained by direct numerical integration of the equations of motion. Included is an in-depth discussion of the numerical [...]
  2. dx.doi.org/doi:10.3888/tmj.20-8 This article presents a numerical pseudo-dynamic approach to solve a nonlinear stationary partial differential equation (PDE) with bifurcations by passing from to a pseudo-time-dependent PDE . The equation is constructed so that the desired nontrivial solution of represents a fixed point of . The numeric solution of is then obtained [...]
  3. dx.doi.org/doi:10.3888/tmj.20-7 This article is a summary of my book A Numerical Approach to Real Algebraic Curves with the Wolfram Language [1]. 1. Introduction The nineteenth century saw great progress in geometric (real) and analytic (complex) algebraic plane curves. In the absence of an ability to do the large number of computations for a concrete theory, the twentieth century [...]
  4. dx.doi.org/doi:10.3888/tmj.20-6 An important problem in graph theory is to find the number of complete subgraphs of a given size in a graph. If the graph is very large, it is usually only possible to obtain upper bounds for these numbers based on the numbers of complete subgraphs of smaller sizes. The Kruskal–Katona bounds are often used [...]
  5. dx.doi.org/doi:10.3888/tmj.20-5 This article explores the numerical mathematics and visualization capabilities of Mathematica in the framework of quaternion algebra. In this context, we discuss computational aspects of the recently introduced Newton and Weierstrass methods for finding the roots of a quaternionic polynomial. Introduction Since Niven proved in his pioneering work [1] that every nonconstant polynomial of the form (1) has at [...]
  6. dx.doi.org/doi:10.3888/tmj.20-4 This article discusses a recently developed Mathematica tool––a collection of functions for manipulating, evaluating and factoring quaternionic polynomials. relies on the package , which is available for download at w3.math.uminho.pt/QuaternionAnalysis. Introduction Some years ago, the first two authors of this article extended the standard Mathematica package implementing Hamilton’s quaternion algebra—the package —endowing it with the ability, [...]
  7. dx.doi.org/doi:10.3888/tmj.20-3 The action of Möbius transformations with real coefficients preserves the hyperbolic metric in the upper half-plane model of the hyperbolic plane. The modular group is an interesting group of hyperbolic isometries generated by two Möbius transformations, namely, an order-two element and an element of infinite order . Viewing the action of the group elements [...]
  8. dx.doi.org/doi:10.3888/tmj.20-2 We propose and implement an algorithm for solving an overdetermined system of partial differential equations in one unknown. Our approach relies on the Bour–Mayer method to determine compatibility conditions via Jacobi–Mayer brackets. We solve compatible systems recursively by imitating what one would do with pen and paper: Solve one equation, substitute its solution into the [...]
  9. dx.doi.org/doi:10.3888/tmj.20-1 We simultaneously introduce effective techniques for solving Sudoku puzzles and explain how to implement them in Mathematica. The hardest puzzles require some guessing, and we include a simple backtracking technique that solves even the hardest puzzles. The programming skills required are kept at a minimum. Introduction to Sudoku Sudoku, for those unfamiliar with this puzzle, consists of [...]
  10. Rubik’s cube has a natural extension to four-dimensional space. This article constructs the basic concepts of the puzzle and implements it in a program. The well-known three-dimensional Rubik’s cube consists of 27 unit subcubes. Each face of determines a set of nine subcubes that have a face in the same plane [...]
   
   
© Jürgen 2019
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