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Posts

November 01, 2014

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Departments of Mathematics in the U.S. have, again this year, formally adopted an agreement to coordinate deadlines for responding to postdoctoral job offers. This agreement ensures that young colleagues entering the postdoctoral job market have as much information as possible about their options before making a decision, and also departmental hiring committees adequate time to review application files and make informed decisions. See details, including the agreed upon deadline for responses […]
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One of the strategies in solving problems is to divide them into cases and see if you can eliminate some impossible cases. In this post, I will discuss a popular classic problem which I found the solution to be interesting. Problem If A, B, C, and D are distinct non-zero digits, find their values if […] Math and Multimedia - School math, multimedia, and technology tutorials.
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Mr. B’s “BRAIN-O” QuizGuaranteed to unclog clogged up […]
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The purpose of this blog post is to give a short, constructive, computation-free proof of the following theorem: Theorem: Every compact subset of the Riemann sphere can be arbitrarily closely approximated (in the Hausdorff metric) by the Julia set of … Continue reading →
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The electronic version of the latest issue of the Girls’ Angle Bulletin is now available on our website. This time, we’re leaving it up to readers to guess what our latest cover represents. This past summer, Girls’ Angle program assistant … Continue reading →
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Which shape is worst of all for packing the plane? That is, which has the lowest maximal packing density? Suppose we demand that our shape be convex and also centrally symmetric: that is, a subset $S \subseteq \mathbb{R}^2$ such that $x \in S$ implies $-x \in S$. Then a certain 'smoothed octagon' is conjectured to be the worst. Amazingly, this shape has a 1-parameter family of maximally dense packings, shown in this image created by Greg Egan.
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As the day began, members of our student GRIT team began entering classrooms, handing teachers bags of treats. At first glance, a bag of candy.  But when you opened, you quickly realized it was more than expected.  There were slips of paper included…handwritten notes from students. The Student GRIT team has copied and dispersed these […]
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I used Battleships and Mines as a review for systems.  We tested our mine coordinates today in the front lobby. And then enjoyed the end of the week with the highlighters and blacklights.
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mindfuckmath: Vampire Numbers Do you vant to learn about vampire numbers? Vampire numbers are numbers of even length that can be factored into two integers of equal length, both of which are comprised of the digits from the original number, and neither of which contain trailing zeroes. The two integers are called the fangs.  For example,  1260 = 21 x 60 1260 is the vampire number, 21 and 60 are its fangs.   1395 = 15 x 93 1395 is the vampire number, 15 and 93 are its fangs. Vampire numbers […]
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I used to work on ships that were used to test undersea equipment. When we had visitors on the ship, we would put a Styrofoam cup on some of our test gear when lowered the equipment to our test depth. … Continue reading →
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Journal of Computational and Applied Mathematics, Volume 270, pages 1-584 (Nov-14) Edited by Pavel Solin, Sascha Schnepp, Pavel Karban
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If you walk along the street you will encounter a number of scientific problems. Of these, about 80 per cent are insoluble, while 19½ per cent are trivial. There is then perhaps half a per cent where skill, persistence, courage, creativity and originality can make a difference. It is always the task of the academic to swim in that half a per cent, asking the questions through which some progress can be made. ~Sir Hermann BondiThe 305th day of the year; 305 is the smallest odd composite which […]

October 31, 2014

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“But is the existence of God just a philosophical question, like, say, the definition of knowledge or the existence of Plato’s forms?” Gary Gutting, NYT Although I stopped following The Stone‘s interviews of philosophers about their views on religion, six more took place and Gary Gutting has now closed the series he started a while […]
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تصحيح تمرين 16 حول النهايات والاتصال النهايات والاتصال تمارين و حلول تصحيح التمرين رقم 16 حول درس النهايات والاتصال للثانية بكالوريا علوم رياضية وتجريبية. أسئلة التمرين : حدد العددين a و b بحيث تكون الدالة :  متصلة على المجال . الحل :  <!-- mathsways336-280 --> (adsbygoogle = […]
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Today the Sutton Trust report “What makes great teaching?” by Rob Coe, Cesare Aloisi, Steve Higgins and Lee Elliot Major was released. It’s a report I’ve eagerly been awaiting and I very much enjoyed reading it. You can download the report in full here free of charge. It’s only around 50 pages long and I’d […]
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I used this lesson in MTH 221 (Mathematics for Elementary Teachers) to address Common Core State Standard 7.G.B.4. It seems to have a lot of potential, but there are still some elements that I think need to be tightened up. These are written in red - along with some other thoughts. I would appreciate any feedback on how to improve this lesson.[Schema Activation]How many of you know your fitted hat size? For example, I wear a seven-and-seven-eighths. Today, you are going to find your hat size […]
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Geef het volgende getal in dit rijtje...1000003, 1000033, 1000037, 1000039, 1000081, ...Ach ja...:-)
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Originally posted on Bits of DNA:Earlier this week US News and World Report (USNWR) released, for the first time, a global ranking of universities including rankings by subject area. In mathematics, the top ten universities are: 1. Berkeley 2.…
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Portrait of the great mathematician Adrien-Marie Legendre, painted in 1820. Adrien-Marie Legendre (French pronunciation: ​[adʁiɛ̃ maʁi ləʒɑ̃ːdʁ]) (18 September 1752 – 10 January 1833) was a French mathematician. Legendre made numerous contributions to mathematics. Well-known and important concepts such as the Legendre polynomials and Legendre transformation are named after him. [...]
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I had a scheduled absence, and a need for Calculus students to occupy themselves for 90 minutes. Amid their normal Throwback Thursday routine, I had them create some art.Take some colored paper, and demonstrate the four major derivative rules: power, product, quotient, and chain. A generic example, specific example, and written explanation were required. Pretty […]
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Recently, I revised the abstractmath.org article on pattern recognition. Doing that that prompted me to write about my own experiences with patterns. Recognizing patterns is something that has always delighted me: it is more of a big deal for me than it does for many other people. That, I believe, is what led me into […]
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Without Haste (2003)  album cover of the Russian rock-group Voskresenie   http://im-possible.info/english/art/misc/cd/voskresenie.html
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wefuckinglovescience: Pumpkin pi!Cartoon by Bill Amend, http://www.foxtrot.com/
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It’s Halloween time and kids will soon be trick-or-treating. But if your kids pool their candy, how can you make sure that each child receives a fair share? That’s where the method of markers can help! The method of markers … Continue reading →
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Card Colm started in October 2004, the first one ("Low Down Triple Dealing") marking the 90th birthday of Martin Gardner (1914–2010). With this one, we therefore complete a decade's worth of explorations of the kind of fun to be had when mathematical principles and a deck of cards get together. We also salute an extremely prolific writer and top notch communicator of mathematics, with something brand new—courtesy of an old friend of his—that we are confident Martin would have found […]
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Links from the week: 1)  Some puzzles from Presh Talwalkar started the week: http://tinyurl.com/ntgfqpk And some more puzzles here: http://cavmaths.wordpress.com/puzzles-and-starters/ 2)  If you can't get enough of James Grime, Reddit did an AMA ('ask-me-anything') thread with him this week: http://tinyurl.com/o75p57h 3)  Evelyn Lamb told us about Euclid, geometry, and a possibly grumpy Omar
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It’s Halloween – it’s also close to election day – let’s combine these events into one big super-terrific class opener! I spent last night at Wegman’s assembling my candy corn population, which consists of lots of “regular” candy corn, and … Continue reading →
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A researcher in Australia who has had several papers retracted following an investigation by her former employer is now facing fraud and other charges. As The Guardian reports: A former University of Queensland academic accused of fabricating research that claimed a breakthrough in treating Parkinson’s disease has been charged with fraud. The Crime and Corruption […]
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