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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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2:37 AM | Dipoles and Pixie Dust

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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1:00 AM | Packing Smoothed Octagons

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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12:46 AM | Treats for Teachers (& a November Challenge)

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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12:29 AM | Battleships & Mines Systems Review

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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12:15 AM | Good Examples of Underwater Pressure

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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12:00 AM | Fourth International Conference on Finite Element Methods in Engineering and Sciences (FEMTEC 2013)

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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12:00 AM | On This Day in Math - November 1

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 […]

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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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10:41 PM | تصحيح تمرين 16 حول النهايات والاتصال

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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9:23 PM | Great teaching leads to student progress

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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8:40 PM | Will it fit?

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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8:25 PM | Het volgende getal is....

Geef het volgende getal in dit rijtje...1000003, 1000033, 1000037, 1000039, 1000081, ...Ach ja...:-)

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8:12 PM | To some a citation is worth $3 per year

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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8:00 PM | Adrien-Marie Legendre

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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8:00 PM | Derivative Facts

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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7:51 PM | Pattern recognition and me

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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7:43 PM | Without Haste

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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7:11 PM | The Method of Markers

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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7:00 PM | End-of-week Potpourri

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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6:18 PM | snapshot from Salem

Filed under: Kids, pictures, Travel Tagged: Halloween, Massachusset, Salem, statue, USA, vacations, witchery

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Winifred Edgerton Merrill fu la prima americana ad ottenere un dottorato in matematica presso la Columbia University nel 1886. Nella sua tesi sviluppò una rappresentazione geometrica degli infinitesimi in diversi sistemi di coordinate, utilizzando lo jacobiano per per derivare le trasformazioni tra gli integrali nei diversi sistemi.Tra matematica e astronomiaNata a Ripon, nel Wisconsin, il 24 settembre del 1862 da Emmet e Clara Edgerton, si trasferisce con la famiglia a New York intorno al […]

Kelly S.E. & Rozner S.A. (2012). Winifred Edgerton Merrill: "She Opened the Door", Notices of the American Mathematical Society, 59 (04) 504-512. DOI: http://dx.doi.org/10.1090/noti818

Citation

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Winifred Edgerton Merrill fu la prima americana ad ottenere un dottorato in matematica presso la Columbia University nel 1886. Nella sua tesi sviluppò una rappresentazione geometrica degli infinitesimi in diversi sistemi di coordinate, utilizzando lo jacobiano per per derivare le trasformazioni tra gli integrali nei diversi sistemi.Tra matematica e astronomiaNata a Ripon, nel Wisconsin, il 24 settembre del 1862 da Emmet e Clara Edgerton, si trasferisce con la famiglia a New York intorno al […]

Kelly S.E. & Rozner S.A. (2012). Winifred Edgerton Merrill: "She Opened the Door", Notices of the American Mathematical Society, 59 (04) 504-512. DOI: http://dx.doi.org/10.1090/noti818

Citation

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Direi che oggi pomeriggio è stato un bel respirare, al Palazzo Brera. Cristina Lazzeroni dell'Università di Birmingham è venuta alle 18 (come avevo scritto nel post precedente) per raccontare del bosone di Higgs, del modello standard e di materia e antimateria. E' una sperimentale presso l'esperimento LHCb al CERN, l'esperimento dedicato proprio alla ricerca su uno dei grandi misteri dell'universo: perché in esso c'è un eccesso di materia (e d'altra parte se non fosse così, non ci sarebbe […]

Aaij R., B. Adeva, M. Adinolfi, C. Adrover, A. Affolder, Z. Ajaltouni, J. Albrecht, F. Alessio, M. Alexander & S. Ali & (2013). First Observation of CP Violation in the Decays of B_{s}^{0} Mesons, Physical Review Letters, 110 (22) DOI: http://dx.doi.org/10.1103/physrevlett.110.221601

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Per i I cieli di Brera, il 24 settembre (domani... scusate per il ritardo nell'annuncio...) alle 18 presso la Sala delle Adunanze dell'Istituto Lombardo nel Palazzo Brera sito in via Brera 28 (Milano), si terrà la conferenza La fisica delle particelle e il Large Hadron Collider: recenti sviluppi e questioni aperte: Cristina Lazzeroni ci introdurrà alla fisica delle particelle e agli studi fatti al Large Hadron Collider del Cern di Ginevra mettendo l’accento su recenti sviluppi come la
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Aad G., J. Abdallah, S. Abdel Khalek, O. Abdinov, R. Aben, B. Abi, S. H. Abidi, M. Abolins, O. S. AbouZeid & H. Abramowicz & (2014). Measurement of the Higgs boson mass from the $H\to \gamma \gamma $ and $H\to Z{Z}^{*}\to 4\ell $ channels in $pp$ collisions at center-of-mass energies of 7 and 8 TeV with the ATLAS detector, Physical Review D, 90 (5) DOI: http://dx.doi.org/10.1103/physrevd.90.052004

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One of the exciting things about mathematical oncology is that thinking about cancer often forces me to leave my comfortable arm-chair and look at some actually data. No matter how much I advocate for the merits of heuristic modeling, when it comes to cancer, data-agnostic models take second stage to data-rich modeling. This close relationship […]

Gallaher, J. & Anderson, A.R. (2013). Evolution of intratumoral phenotypic heterogeneity: the role of trait inheritance., Interface Focus, 3 (4) 20130016. arXiv: 1305.0524v1

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mathfour tweeted: @mathfour

Hey @mattBgomez - I need an ios app for @KateCrowder (5yo) for sight words. What's the best? #thanks #help #expert

2014-11-01 12:30:06

DrMathochist tweeted: @DrMathochist

RT @davechensky: Symmetry @ Minneapolis-St. Paul International Airport http://t.co/cJvUG3oayZ

2014-11-01 12:24:47

srcav tweeted: @srcav

@SteveWatson10 @preecemaths I see, I suppose the coefficients could always be written as multiples of simple case, may think k deeper on it.

2014-11-01 12:15:51

srcav tweeted: @srcav

@SteveWatson10 @preecemaths more examples of the links between topics? Or more examples of binomial linking to compound?

2014-11-01 12:12:57

srcav tweeted: @srcav

2014-11-01 12:08:51

srcav tweeted: @srcav

.@preecemaths you were also the NQT in this one: "Compound interest and the Binomial Expansion" http://t.co/10y69Gu4j6

2014-11-01 12:03:39

mathfour tweeted: @mathfour

The Bat Princess! #halloween http://t.co/zqsf8dVGdA

2014-11-01 11:55:21

srcav tweeted: @srcav

Great Teaching: a look at the @suttontrust report released yesterday #edchat #ukedchat http://t.co/m0s6ERk2qf

2014-11-01 11:55:11

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