Claudi Alsina

¿Hacia dónde señala en realidad el dedo de Colón en Barcelona? ¿Cuál es el número secreto de la Sagrada Familia? ¿Puede una torre de telecomunicación ser un reloj de sol? ¿Qué enigmáticas funciones debía cumplir el Escorial? ¿Qué misterios envuelven las Meninas del Prado? ¿Cuál es el secreto de las decoraciones de la Alhambra? ¿Cómo se calculó la fachada del Guggenheim de Bilbao? ¿Es Finisterre el fin del mundo? ¿Por qué los mapas de metro se parecen todos al de Londres? ¿Por qué Brunelleschi hizo una cúpula dentro de otra en Florencia? ¿Qué motivó que se empezasen a construir ciudades con formas de polígonos? ¿Se vive bien dentro de un cubo inclinado? ¿Qué secretos esconde Hagia Sohpia en Estambul? ¿Por qué las grandes cúpulas americanas las hizo el valenciano Guastavino? ¿Cómo son los grandes rascacielos? ¿Cómo lograr un auditorio en el que el sonido sea perfecto? ¿Cómo se aseguraron en los parques Disney de que siempre haya colas de espera? ¿Cómo se numeran las calles en Buenos Aires? ¿Qué nos esconde la Gran Pirámide? ¿Cómo logran en Dubai que la primera línea de mar crezca cada año? ¿Puede un extranjero ir en el metro de Tokio sin perderse? Un ameno recorrido por los secretos, misterios y curiosidades matemáticas que esconden las ciudades y los edificios más emblemáticos del mundo.

Una guía para disfrutar de 125 maravillas mundiales y descubrir muchas más

Geometría para turistas

Berthold Schweizer

Maurice J. Frank

The functional equation of associativity is the topic of Abel's first contribution to Crelle's Journal. Seventy years later, it was featured as the second part of Hilbert's Fifth Problem, and it was solved under successively weaker hypotheses by Brouwer (1909), Cartan (1930) and Aczel (1949). In 1958, B Schweizer and A Sklar showed that the ?triangular norms? introduced by Menger in his definition of a probabilistic metric space should be associative; and in their book Probabilistic Metric Spaces, they presented the basic properties of such triangular norms and the closely related copulas. Since then, the study of these two classes of functions has been evolving at an ever-increasing pace and the results have been applied in fields such as statistics, information theory, fuzzy set theory, multi-valued and quantum logic, hydrology, and economics, in particular, risk analysis.This book presents the foundations of the subject of associative functions on real intervals. It brings together results that have been widely scattered in the literature and adds much new material. In the process, virtually all the standard techniques for solving functional equations in one and several variables come into play. Thus, the book can serve as an advanced undergraduate or graduate text on functional equations.

Triangular Norms and Copulas

Associative Functions

Roger B. Nelsen

Solid geometry is the traditional name for what we call today the geometry of three-dimensional Euclidean space. This book presents techniques for proving a variety of geometric results in three dimensions. Special attention is given to prisms, pyramids, platonic solids, cones, cylinders and spheres, as well as many new and classical results. A chapter is devoted to each of the following basic techniques for exploring space and proving theorems: enumeration, representation, dissection, plane sections, intersection, iteration, motion, projection, and folding and unfolding. The book includes a selection of Challenges for each chapter with solutions, references and a complete index. The text is aimed at secondary school and college and university teachers as an introduction to solid geometry, as a supplement in problem solving sessions, as enrichment material in a course on proofs and mathematical reasoning, or in a mathematics course for liberal arts students.--

Solid Geometry in the 21st Century

A Mathematical Space Odyssey

A Cornucopia of Quadrilaterals collects and organizes hundreds of beautiful and surprising results about four-sided figures—for example, that the midpoints of the sides of any quadrilateral are the vertices of a parallelogram, or that in a convex quadrilateral (not a parallelogram) the line through the midpoints of the diagonals (the Newton line) is equidistant from opposite vertices, or that, if your quadrilateral has an inscribed circle, its center lies on the Newton line. There are results dating back to Euclid: the side-lengths of a pentagon, a hexagon, and a decagon inscribed in a circle can be assembled into a right triangle (the proof uses a quadrilateral and circumscribing circle); and results dating to Erdős: from any point in a triangle the sum of the distances to the vertices is at least twice as large as the sum of the distances to the sides. The book is suitable for serious study, but it equally rewards the reader who dips in randomly. It contains hundreds of challenging four-sided problems. Instructors of number theory, combinatorics, analysis, and geometry will find examples and problems to enrich their courses. The authors have carefully and skillfully organized the presentation into a variety of themes so the chapters flow seamlessly in a coherent narrative journey through the landscape of quadrilaterals. The authors' exposition is beautifully clear and compelling and is accessible to anyone with a high school background in geometry.

A Cornucopia of Quadrilaterals

Justyna Sikorska

Maria Santos Tom s

The book provides a comprehensive overview of the characterizations of real normed spaces as inner product spaces based on norm derivatives and generalizations of the most basic geometrical properties of triangles in normed spaces. Since the appearance of Jordanvon Neumann's classical theorem (The Parallelogram Law) in 1935, the field of characterizations of inner product spaces has received a significant amount of attention in various literature texts. Moreover, the techniques arising in the theory of functional equations have shown to be extremely useful in solving key problems in the characterizations of Banach spaces as Hilbert spaces. This book presents, in a clear and detailed style, state-of-the-art methods of characterizing inner product spaces by means of norm derivatives. It brings together results that have been scattered in various publications over the last two decades and includes more new material and techniques for solving functional equations in normed spaces. Thus the book can serve as an advanced undergraduate or graduate text as well as a resource book for researchers working in geometry of Banach (Hilbert) spaces or in the theory of functional equations (and their applications).

Norm Derivatives and Characterizations of Inner Product Spaces

Sätze und ihre Beweise bilden das Herz der Mathematik. Diese Sammlung bezaubernder Beweise, verblüffender Argumente und überzeugender bildlicher Darstellungen lädt den Leser ein, sich an der Schönheit der Mathematik zu erfreuen, seine Entdeckungen mit anderen zu teilen und bei dem Finden neuer Beweise mitzumachen. Das Buch umfasst folgende Themen: natürliche Zahlen, besondere reelle Zahlen, Punkte in der Ebene, Dreiecke, Quadrate, andere Vielecke, Kurven, Ungleichungen, ebene Parkettierungen, Origami, Beweise mit Färbungen, dreidimensionale Geometrie, usw. Jedes Kapitel endet mit einigen Aufgaben, die den Leser in die Kunst des Auffindens von bezaubernden Beweisen einbezieht. Es gibt insgesamt über 130 solcher Aufgaben.

Eine Reise durch die Eleganz der Mathematik

Bezaubernde Beweise

Introduces the richness and variety of inequalities in mathematics using illustration and visualisation.

Visualizing Basic Inequalities

When Less is More

Roger Nelsen

Inequalities permeate mathematics, from the Elements of Euclid to operations research and financial mathematics. Yet too often the emphasis is on things equal to one another rather than unequal. While equalities and identities are without doubt important, they don't possess the richness and variety that one finds with inequalities. The objective of this book is to illustrate how use of visualization can be a powerful tool for better understanding some basic mathematical inequalities. Drawing pictures is a well-known method for problem solving, and we would like to convince you that the same is true when working with inequalities. We show how to produce figures in a systematic way for the illustration of inequalities; and open new avenues to creative ways of thinking and teaching. In addition, a geometric argument can not only show two things unequal, but also help the observer see just how unequal they are.

Claudi Alsina

About

Books

Join the club