Prof.Dr. Claus Haetinger
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RESEARCH INTERESTS AND PUBLICATIONS

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INTRODUCTION

    The world in that we lived today, although we don't perceive, depends fundamentally of the Mathematics.
    The eletromagnetic waves for TV and the phone information through satellite had your existence firstly discovered in the Mathematics, later in the Physics. 
    The theoretical aspects of the computation were developed by mathematicians as J. von Neumann and A. Turing. 
  The development of a motor, of an electric circuit or of a computer chip need an enormous amount of mathematical calculations and of Mathematical Theories, as well as most of the electric apparels. 
    The industrial era was only possible due to the Physics development and of the Mathematics due by Newton, Lagrange, Fourier, Cauchy, Gauss and other cientists. 
    The fractal groups appear in the mathematicians Hausdorff's and Besikovich's works, and later they were popularized by B. Mandelbrot. The illustrations that appear in the Microsoft Encarta Enciclopedy are made by compactifications of images   obtained by adaptation of mathematical ideas of fractal auto-similarity due by the mathematician M. Barnsley. The physical explanation of the phenomenon of the water to become ice at zero degrees and of the magnetization of objects to low temperatures, demands aplicattions of the Mathematical Theory of Probability. This Theory, in the beginning, was just devoted to calculate chances of to win or to lose in the roulette games. This before penetrating in the Statistical and Quantum Mechanics as irreplaceable tool. It suits to remind that the mathematician W. Gibbs was one of the cientists that established the beginnings of the Statistical Mechanics. 
    The understanding of the Theory of the Relativity of Einstein and of the "black holes" of S. Hawking owes to the development of the Non Euclidian Geometries (The Axiom of the Parallels of Euclides - century IV B.C.) due by Gauss, Riemmann and Poincaré. The subject, if it was or not possible to deduce the Axiom of the Parallels ones starting from other, extended for more than 20 centuries to be denied by Lobachewski in the century XIX. Then appear the Riemmann's and Hyperbolic Geometries. The phenomenon that the light had constant speed independently of the observer's referencial that measured it, pointed for the direction that the space-time should have some curvature. Einstein, that learned the Riemmann's Geometry, found a mathematical model for the phenomena in subject, through a convenient Non Euclidian Geometry. 
    Several Mathematical Theories resulted, later, in tools for the understanding of models of the natural science with the ones which at first they didn't seem to have any relationship. 
    The complex numbers, introduced to give sense to the existence of solutions of polynomial equations, they led to the study of the diferencial calculus with complex numbers. This Theory resulted to be, later, extremely useful to explain the drainage of incomprehensible fluids. S. Hawking theory to explain the "black  holes" needs results involving complex numbers and Quantum Mechanics (therefore, it requests results of the Theory of the Probability). The formalization of the Quantum Mechanics was only possible road the fundamentation given by the mathematician J. von Neumann, using the theory of spaces of functions largely developed by the mathematician D. Hilbert, that would never imagine that your mathematical theory of the beggining of the century XX would apply the such subject. 
    The mathematical Theory of the wavelets, developed mainly about 1970, allowed considerable progresses in computerized tomography. 
    The text-book of Biology, Economy, Agronomy, etc, used nowadays in the Universities, contain very more mathematical and statistical formulas that used them 20 years ago. 
    The tendency of all the Sciences is more and more to use and to develop Mathematical Models to describe natural phenomena in an appropriate way. 
    The intense rhythm of the technological development of the current times produces the following phenomenon: it is every times shorter the current time between the development of a mathematical theory and your practical use. 
    In the social sciences, the Statistics is, nowadays, extremely useful tool for any professional of the area. Even to invest in the  financials market we need mathematical and probabilistic theories that make possible to maximize the gained profit exist. 
    In summary, we can affirm that the domain of the use of the Mathematics, nowadays, is a necessary condition for the success in an enormous amount of professions. The projections for the close future indicate that this tendency should intensify if. To the United States it projected that already at this beginning of the century XXI the white-collars (workers that need some study of undergraduate level) they will be in larger number than the blue-collars (manual workers). The automation and the computer will also produce the occurrence of the same phenomenon in the rest of the world in a reasonably close future.
    In most of the undergraduate level programs in the United States, the student should take some courses of Mathematics. In a modern society in that the "efficiency" is one of the larger objectives, to maximize benefits and to minimize losses is essential.  In these cases, invariably, some mathematical model should enter in scene. 
 
    Now, after that we believed to have become aware the visitor of the importance of the Mathematics in the current world, we will talk a little about the professionals that act in this area. 

    Some times it is ignored by the common citizen that the Mathematics is an alive Science and that an intense research work is developed nowadays in this area. 

  "In the last thirty years the amount of written pages of works published in Mathematics
is larger than the number of pages written on Mathematics from old Greece up to thirty years ago". 
A. Odlyzko, of the ATTN & T Bell Laboratories 
 
      A lot of reasons compete for the ignorance of the research in Mathematics. 
    The first of them is that for your own nature, a mathematical result uses other previous results and so on so that it is difficult to describe for a lay one the importance of the current results obtained by the mathematicians. Thus, the common citizen doesn't have knowledge, in general, of the current research in Mathematics. It also suits to remind that the Mathematics that is learned today at the high school and at the undergraduate levels, that is applied in an enormous amount of practical situations, was considered mathematical research at some time ago.
    The second reason, perhaps it is the fact that the Nobel Prize doesn't exist in Mathematics. A. Nobel (1833-1896) a Swedish cientist that created a foundation was that annually presses cientists of several areas of the knowledge as Physics, Chemistry, Medicine, Literature, etc. As a Nobel Prize doesn't exist in Mathematics, many think mistakenly that doesn't exist current researches in this area. The prize corresponding to the Nobel Prize, in the area of the Mathematics is the Fields Medal that is granted by International Mathematical Union every 4 years to 4 mathematicians distinguished that are less than 40 years old. Recently, the french mathematician  J.C. Yoccoz of the University of Paris-Sud received this prize. He passed great part of your life in Brazil working and developing mathematical researches with Brazilian researchers.
    Intense research work is develop today in the central areas of the Mathematics.
    Fractals, the Chaotic Systems, Cellular Automata, the Theory of the Catastrophes, the Geometry of the Minimum Varieties, the Applications of Algebraic Topology to problems of Quantum Mechanics, the Theory of the wavelets, the Mathematical Applications to the Theory of the Computation are some of the topics that more became popular.
    Other equally important and deep themes are being developed by mathematicians, although it is difficult to explain your importance for lay people.
    Nothing impedes that these topics pass suddenly to be mentioned in papers of larger popularization, when somebody finds a real model in that such theories can be applied.
    Recently an English mathematician solved the celebrated last Fermat's conjecture.
    The Riemmann's conjecture concerning the zeros of a certain function is the more famous of the still not resolved conjectures of the current Mathematics. A series of other important subjects in Geometry, Analysis, Algebra and in Quantum Mechanics  would be mathematically resolved if such conjecture is true.
    Ricardo Mañé (1948-1995), a mathematician working in IMPA (Rio de Janeiro), solved in 1987 the conjectures of the structural stability that was considered one of the most important results of the Theory of the Chaotic Systems.
    Celso Costa in your doctoral thesis in IMPA (Rio de Janeiro), exhibited in 1982 an example of a minimum surface with certain special properties. This example also answers negatively one famous conjecture. This surface, that is known in the whole world as the surface of Costa, was inspired, according to the author, for a hat of one samba school personate of Rio de Janeiro.
   
    The universe of the mathematical problems which we don't have the smallest idea of how to solve them is inexhaustible. At the same time, at all times, the natural science, collaborating with the Mathematics, suggests a series of new mathematical problems whose solution is important and still ignored.
    The mathematician develops the Mathematical Theories by following his intuition of what is fundamental and deep in Mathematics. The Mathematics is fundamentally "resolution of mathematical" problems.
    The renowned botanical Sir Arcy Thompson said that everything that is beautiful in Mathematics, earlier or later will be of importance in some natural phenomenon.
    When a mathematician finds the solution for some mathematical problem and this result seems him interesting, he wants your friends to appreciate it. The fruit of this work is published then in an article of Mathematics of international circulation, the so called papers. Later, some of these results (in general that have more importance of the mathematical point of view) become used by cientists of other more applied areas.

    The Mathematics, in a certain sense, is an art. The analysis and the ingeniousness in the obtaining of the solution of a mathematical problem possess an intrinsic aesthetic value. A series of results they insert "magicianly" in a final result that, or it surprises, or it enchants, or it places us a flea behind the ear: will it be really truth?
    The mathematical proof is what finally will decide if the result is right or wrong. The proof in Mathematics plays the same part that the experience carries out in the Physics. It is the referencial of the truthfulness or not of the mathematical result.
   Many times, when one need to use a certain technique, the real situation is not so equal to that was learned in the university. It is necessary to do small fittings in the model that was taught. At this time, to understand the mathematical result (and sometimes until your proof) it can be of great usefulness.
    Exactly due to your mathematical proof, a mathematical result is eternal. It is today valid as well as it will be from here to thousands of years; in other words, assumed certain hypotheses, it proceeds of the mathematical proof that such and such properties are valid.

    Finally, let us say some about the research in Algebra.
    The last quarter of the century XX went of unprecedented accomplishments to the Algebra. All heard to speak of the proof  of the Last Theorem of Fermat. Although not so commented, not less important it was the obtaining of the classification of the simple finite groups. However, which few know, it is that the own existence of World Wide Web is only possible due to efficient codes brokers of errors and to simple and trusted methods of cryptography, all based on algebraic systems. Other implications of the Algebra would be: digital media (CD, DVD, etc.), cellular telephony, theory of information (transmission and correction of digital data), etc. the amount of subjects that we don't know how to answer is horribly larger than the number of established results. Therefore, we participated in the

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RESEARCH GROUP REGISTERED AT CNPq
   
    Some of these pages below have been written in Portuguese.
    
ALGEBRA: THEORY, TEACHING, USES AND APPLICATIONS 
(UNIVATES) -
Leader and Researcher
RESEARCH INTERESTS LINES

 

- Ring Theory

 

- Uses of New Technologies in Education

 

- Mathematical Modelling



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PUBLICATIONS

    I have published two books:

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Articles (Research Papers)

    I am member of the editorial board from The Aligarh Bulletin of Mathematics, Caderno Pedagógico, Destaques Acadêmicos, Olimpíada Matemática da UNIVATES.
    I am referee from the following journals:



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Articles Published at Annals of Meetings
Aracaju.jpg
Univates_Panoramica
Porto-Alegre
  Santos_2004
  Santa_Marta_Colombia_2002
Santos_WCETE_2004

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Course Gallery: Some Given Lectures and Other Preprints

   
These are some of the courses and lectures I have taught in many meetings. Some of them have been written in Portuguese.
    You can download PDF files for some of the preprints below.  Files for the other preprints will be available soon.
 Campinas_2004 Campinas
La_Falda_Argentina_2001
Belo_Horizonte
Valle_Hermoso_Argentina_2004Valle_Hermoso_2
70_anos_Miguel.jpgalmoco_70_anos_Miguel
 Vina_del_Mar_Chjle_2006
 Mexico_2003
 Valle_Hermoso_Argentina_2004
 bahai-temple-new-delhi-india.jpg
Claus_Taj_m03.jpg
Claus_Fatherpur_Sikri_m01.jpg
 Buenos_Aires_2001
Maringa_2004Diamantina  Porto_AlegreRio_Janeiro
Sao_PauloBrasiliaFlorianopolisRecifeRio_Grande

Catedral_PelotasNovo_HamburgoSao_LeopoldoCanela_CaracolAguas_de_LindoiaCabo_FrioParque_do_CaracolGramado

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Date of  the last updating: 31/12/2011

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