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# Posts

### December 05, 2013

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Filed under: pictures, Travel, University life Tagged: bois de Boulogne, La Défense, Paris, sunset
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Reference: Moore, Thomas A., A General Relativity Workbook, University Science Books (2013) – Chapter 16; Box 16.1. In Schwarzschild (S) space-time, the energy of a particle is given by Outside the event horizon and since the S coordinate represents time, it must constantly increase as the proper time increases, so , with the result that […]
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Populating a large spreadsheet table can be slow if we push data cell-by-cell. Here is a small example. Naïve approach We start with creating a 1000x1000 table by directly accessing individual cells. Private Sub run1()    Dim r As Range    Set r = Range("Sheet1!B2")    r.Resize(m + 1, n + 1).ClearContents    Dim t0 As […]
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12 - 5 - 1 = 3! Also: 1^2 = 5 - 1 - 3 Also: 12 / (5 - 1) = 3
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British translator and editor David McDuff blogs at "Nordic Voices in Print" -- a site that he uses as "a way of making some of my translations of Nordic poetry and prose available online."  Here is "stones" -- the third of a group of ten poems he has posted by Icelandic poet Sjón.  This one involves a few numbers and I present it here as a math-poetry token of the fascinating land I am planning to visit: a five-day Iceland vacation adventure, traveling with my Eastern Village […]
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Bright, brave, open minds: Open online course, Part I Full recording: voice, text chat, slides. {WebinarRecordingTip.png} Join parents, teachers, and researchers interested in math circles for two live, highly interactive online events that are also a part of the open online course Bright, Brave, Open Minds: A Problem Solving Kaleidoscope. In Part I, Julia Brodsky will give a brief introduction to the Art of Inquiry project, its math circles, and the Open Minds book. In Part II, Julia Brodsky […]
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The members’ journal of the Royal Spanish Mathematical Society, La Gaceta de la RSME, has published an article written by Migel Ángel Herrero (Universidad Complutense de Madrid) under the title “Matemáticas para el planeta Tierra, ciencia para el bienestar humano” … Continue reading →
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The Mathematical Association of America will be honoring the following award winners at the 2014 Joint Mathematics Meetings in Baltimore: Certificate for Meritorious Service
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5415 = 3 x 5 x 19 x 19.5415 is a number n such that n and its reversal (5145) are both multiples of 15 (A062905).5415 is a number n such that the sum of the digits of n equals the squarefree part of n (A070274).5415 is the smallest number n such that 2n + 1, 4n + 1, 6n + 1, 8n + 1, and 10n + 1 are all prime numbers (A124410).5415 is a number that cannot be written as a sum of three squares.5415 is a divisor of 6812 - 1.Source: On-Line Encyclopedia of Integer Sequences
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A preface to Polya's prefaceI'm going to admit to a personal bias here. How to Solve It was a real revelation to me when I first encountered it. The book managed, in wonderfully simple and direct language, to fully form ideas that I had been struggling to bring into focus for years. I discovered the book in my early twenties just as I was getting serious about mathematics. It significantly improved my analytic thinking. More importantly, it made me more self-aware of the process. Polya taught […]
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(Click on the cartoon to see the full image.) (C)Copyright 2013, C. Burke.Yeah, it was supposed to be Monday's comic, but Real Life and All That . . . The sentiment is still true, though.
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This has nothing to do with the math classroom. I was just talking to my husband tonight about our engineering school experiences and I thought of this anecdote. I declared a major in Computer Engineering in 1993. I had some computer experience – I was a gamer, I knew how to e-mail, and I’d done […]
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In Geometria Euclidea, la retta di Eulero è la retta passante per l'ortocentro, il baricentro ed il circocentro, che sono tre dei quattro punti notevoli di un triangolo. Il quarto, come sappiamo, è l'incentro.Nell'applet, che ho costruito con GeoGebra, potete osservare che, muovendo i vertici e modificando il triangolo, la retta di Eulero passa sempre per i tre punti notevoli citati.Il fatto che questi tre punti notevoli siano allineati viene dimostrato dal Teorema di Eulero:In […]

### December 04, 2013

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To say this is a big announcement would be a drastic understatement!!  Again this year, the talented sellers at Teachers Pay Teachers have teamed up to show their appreciation for the hardest working group of individuals on the planet--TEACHERS! Two years ago, a couple of TpT teachers solicited holiday tips and freebies from 50 TpT sellers and collected them into a book. Last year, the one book became four, with editions for PreK-K, 1-2, 3-6, and 7-12. The […]
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We're slogging through exponential functions in Algebra.  I really think there's some merit to reordering the units and teaching quadratics before exponentials because the symmetry can be useful in graphing, although the algebraic methods associated with quadratics are heavier, so perhaps I'm wrong to consider moving that unit first. That's something to hash out later.Anyway, my students have worked through arithmetic and geometric sequences and we've made the connection that graphing […]
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While waiting for Jean-Michel to leave a thesis defence committee he was part of, I read this recently arXived survey by Novak and Rudolf, Computation of expectations by Markov chain Monte Carlo methods. The first part hinted at a sort of Bernoulli factory problem: when computing the expectation of f against the uniform distribution on […]
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Il blog vive una piccola fase di stallo, per motivi di vita e lavoro, e non viene aggiornato con la solita frequenza. Comunque è meglio non dir nulla che dover scrivere compulsivamente basta che sia. In attesa di un articolo serissimo, che arriverà presto, un'incursione nel campo della vignetta. http://keespopinga.blogspot.com/feeds/posts/default?alt=rss
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MPE 2013+, which extends MPE2013 into the future, is kicking off in January with a workshop, Mathematics of Planet Earth: Challenges and Opportunities – Introducing Participants to MPE 2013+ Topics, which will be held at Arizona State University January 7-10, 2014. The workshop aims to expose students and junior researchers to the challenges facing our planet, the role of the mathematical sciences in addressing those challenges, and the opportunities to get involved in the effort. Continue […]
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Many mathematicians have heard of Girolamo Cardano (sometimes called Jerome Cardan). His book Ars Magna (The Great Art), published in 1545, presents the first advances in algebra made in Europe since classical times, in particular the solution of a general … Continue reading →
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Filed under: pictures, Travel, University life Tagged: bois de Boulogne, La Défense, Paris, sunset
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Wow, awesome. Lecturers include Rachael Briggs, Sonja Smets, and Florian Steinberger. The Munich Center for Mathematical Philosophy (MCMP) is organizing the first Summer School on Mathematical Philosophy for Female Students, which will be held from July 27 to August 2, 2014 in Munich, Germany. The summer school is open to excellent female students who want to specialize in mathematical philosophy. Since women are significantly underrepresented in philosophy generally and in formal philosophy […]
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LMU Munich, July 27 - August 2, 2014http://www.mcmp.philosophie.uni-muenchen.de/news/mathsummer2014/The Munich Center for Mathematical Philosophy (MCMP) is organizing the first Summer School on Mathematical Philosophy for Female Students, which will be held from July 27 to August 2, 2014 in Munich, Germany. The summer school is open to excellent female students who want to specialize in mathematical philosophy.Since women are significantly underrepresented in philosophy generally and in formal […]
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Am 09.11.2013 verließen zwei russische Astronauten die Internationale Raumstation ISS für einen Außeneinsatz mit einem ganz besondern Gegenstand in der Tasche. Die Olympische Fackel. Es war nicht der erste Besuch einer Olympischen Fackel auf der ISS, aber der erste Weltraumsparziergang mit ihr. Doch schon bevor sich die Fackel auf den … weiterlesen →
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On BrainPickings I came across a review of an absolutely stunning version of Euclid’s Elements. Produced in 1847 by mathematician Oliver Byrne, the book is obsessively visual like the proof below of the Pythagorean Theorem. I would love to find a poster for my office. Sadly Google came up empty. I did happen to find [...]
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Do you use any of the following words or phrases with your students?"Borrow""Carry""Goes into""Altogether""Reduce"In Christine Moynihan's 2013 Fall NCSM Newsletter article "Leadership Tips", she focuses on how “Learning is not attained by chance. It must be sought for with ardor and attended to with diligence.”Too many words and phrases used in mathematics classrooms promote misconceptions and are barriers to students attaining conceptual understanding. Identifying and eradicating them […]
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12 = 4 * 1 * 3 Also: 1 + 2 + 4 = 1 + 3! Also: |1 + 2 - 4| = 1^3
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Last year, my classroom's Christmas decorations were rather insubstantial.  I had a tree.  Okay, I had a magnetic tree.  I even put it up again this year.Magnetic Tree on my Dry Erase BoardThis year, I made some new additions.  I hung garland above my dry erase board.Garland Around My Dry Erase BoardI hung garland over the door to my classroom. Garland Around my DoorYou cant see them that well in this picture, but I put Christmas lights around my bulletin board. […]
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Brian has spent too much time analyzing his leaf raking. He has created an investigation that asks students to calculate how long it would take different numbers of rakers to finish cleaning his yard of leaves. Students see the inverse…Read more →