Nature’s Optics and Our Understanding of Light

2018 ◽  
Vol 6 (2) ◽  
pp. 23-67
Author(s):  
Michael Berry

Optical phenomena visible to everyone abundantly illustrate important ideas in science and mathematics. The phenomena considered include rainbows, sparkling reflections on water, green flashes, earthlight on the moon, glories, daylight, crystals, and the squint moon. The concepts include refraction, wave interference, numerical experiments, asymptotics, Regge poles, polarisation singularities, conical intersections, and visual illusions

Author(s):  
Michael Berry

Optical phenomena visible to everyone abundantly illustrate important ideas in science and mathematics. The phenomena considered include rainbows, sparkling reflections on water, green flashes, earthlight on the moon, glories, daylight, crystals, and the squint moon. The concepts include refraction, wave interference, numerical experiments, asymptotics, Regge poles, polarisation singularities, conical intersections, and visual illusions


Filomat ◽  
2012 ◽  
Vol 26 (3) ◽  
pp. 607-613 ◽  
Author(s):  
Xiang Wang ◽  
Dan Liao

A hierarchical gradient based iterative algorithm of [L. Xie et al., Computers and Mathematics with Applications 58 (2009) 1441-1448] has been presented for finding the numerical solution for general linear matrix equations, and the convergent factor has been discussed by numerical experiments. However, they pointed out that how to choose a best convergence factor is still a project to be studied. In this paper, we discussed the optimal convergent factor for the gradient based iterative algorithm and obtained the optimal convergent factor. Moreover, the theoretical results of this paper can be extended to other methods of gradient-type based. Results of numerical experiments are consistent with the theoretical findings.


2006 ◽  
Vol 100 (2) ◽  
pp. 94-99
Author(s):  
Seán P. Madden ◽  
Jocelyn M. Comstock ◽  
James P. Downing

How big is the earth? How far away is the moon? How big is the moon? How tall are the mountains on the moon? These wonderfully naïve questions have been asked for centuries by children and astronomers alike. A great bonus for mathematics and science teachers is that with basic concepts from the high school curriculum and data that students can collect themselves, these questions can be answered to a high degree of accuracy.


2018 ◽  
Vol 9 (2) ◽  
pp. 91-105
Author(s):  
D. Brunetto ◽  
C. Andrà ◽  
N. Parolini ◽  
M. Verani

Abstract This paper aims at bridging Mathematical Modelling and Mathematics Education by studying the opinion dynamics of students who work in small groups during mathematics classrooms. In particular, we propose a model which hinges upon the pioneering work of Hegselmann and Krause on opinion dynamics and integrates recent results of interactionist research in Mathematical Education. More precisely, the proposed model incorporates the following features: 1) the feelings of each student towards the classmates (building upon the so-called \I can" -\you can" framework); 2) the different levels of preparation of the students; 3) the presence of the teacher, who may or may not intervene to drive the students towards the correct solution of the problem. Several numerical experiments are presented to assess the capability of the model in reproducing typical realistic scenarios.


Author(s):  
Thomas Owens

This book explores some of the exultant visions inspired by Wordsworth’s and Coleridge’s close scrutiny of the night sky, the natural world, and the domains of science. It examines a set of scientific patterns drawn from natural, geometric, celestial, and astronomical sources which Wordsworth and Coleridge used to express their ideas about poetry, religion, literary criticism, and philosophy. It establishes the central important of analogy in their creative thinking. Analogies prompted the poets’ imaginings in geometry and cartography, in nature (representations of the Moon) and natural history (studies of spider-webs, streams, and dew), in calculus and conical refraction, and in the discovery of infra-red and ultraviolet light. Although this is primarily a study of the patterns which inspired their writing, the findings overturn the prevalent critical consensus that Wordsworth and Coleridge did not have the access, interest, or capacity to understand the latest developments in nineteenth-century astronomy and mathematics, which they did in fact possess. This research reinstates many relationships which the poets had with scientists and their sources. Most significantly, the book illustrates that these sources are not simply another context or historical lens through which to engage with Wordsworth’s and Coleridge’s work but are instead a controlling device of the symbolic imagination. Exploring the structures behind Wordsworth’s and Coleridge’s poems and metaphysics stakes out a return to the evidence of the Romantic imagination, not for its own sake, but in order to reveal that their analogical configuration of the world provided them with a scaffold for thinking, an intellectual orrery which ordered artistic consciousness and which they never abandoned.


2008 ◽  
Vol 18 (02) ◽  
pp. 285-311
Author(s):  
ALEXANDRE TAVARES BARAVIERA ◽  
MARCELO MENDES DISCONZI

Coupled Map Lattices (CML) are a kind of dynamical systems that appear naturally in some contexts, like the discretization of partial differential equations, and as a simple model of coupling between nonlinear systems. The coupling creates new and rich properties, that has been the object of intense investigation during the last decades. In this work we have two goals: first we give a nontechnical introduction to the theory of invariant measures and equilibrium in dynamics (with analogies with equilibrium in statistical mechanics) because we believe that sometimes a lot of interesting problems on the interface between physics and mathematics are not being developed simply due to the lack of a common language. Our second goal is to make a small contribution to the theory of equilibrium states for CML. More specifically, we show that a certain family of Coupled Map Lattices presents different asymptotic behaviors when some parameters (including coupling) are changed. The goal is to show that we start in a configuration with infinitely many different measures and, with a slight change in coupling, get an asymptotic state with only one measure describing the dynamics of most orbits coupling. Associating a symbolic dynamics with symbols +1, 0 and -1 to the system we describe a transition characterized by an asymptotic state composed only of symbols +1 or only of symbols -1. We rigorously prove our assertions and provide numerical experiments with two goals: first, as illustration of our rigorous results and second, to motivate some conjectures concerning the problem and some of its possible variations.


Author(s):  
D.H. Mellor

Before Ramsey died at the age of 26 he did an extraordinary amount of pioneering work, in economics and mathematics as well as in logic and philosophy. His major contributions to the latter are as follows. (1) He produced the definitive version of Bertrand Russell’s attempted reduction of mathematics to logic. (2) He produced the first quantitative theory of how we make decisions, for example about going to the station to catch a train. His theory shows how such decisions depend on the strengths of our beliefs (that the train will run) and desires (to catch it), and uses this dependence to define general measures of belief and desire. This theory also underpins his claim that what makes induction reasonable is its being a reliable way of forming true beliefs, and it underpins his equation of knowledge generally with reliably formed true beliefs. (3) He used the equivalence between believing a proposition and believing that it is true to define truth in terms of beliefs. These in turn he proposed to define by how they affect our actions and whether those actions fulfil our desires. (4) He produced two theories of laws of nature. On the first of these, laws are the generalizations that would be axioms and theorems in the simplest true theory of everything. On the second, they are generalizations that lack exceptions and would if known be used to support predictions (‘I’ll starve if I don’t eat’) and hence decisions (‘I’ll eat’). (5) He showed how established, for example optical, phenomena can be explained by theories using previously unknown terms, like ‘photon’, which they introduce. (6) He showed why no grammatical distinction between subjects like ‘Socrates’ and predicates like ‘is wise’ entails any intrinsic difference between particulars and universals.


Sign in / Sign up

Export Citation Format

Share Document