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4:36 AM | justasipwetyourlips:
watcheditbegin:
Dear person reading this,
You made it through another year....

justasipwetyourlips:
watcheditbegin:
Dear person reading this,
You made it through another year. You made it through the hard times and pain. You made it through all the times when you all you wanted to do was give up. You made it. You made it another year and I promise you can make it another year. I am SO proud of you.
I needed this.

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The song “The Twelve Days of Christmas” is a carol where the number of gifts keeps increasing cumulatively each day. On the Nth day, the recipient gets N gifts, plus the number of gifts given on each previous days. How many gifts are given in all for the 12 days? What’s a general formula? Here […]

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This is the eighth year that I'm doing Christmas comics, and in that times I've amassed nearly two dozens posts with the Christmas tag. (And there are random posts missing the tag that should have it.) This begs the question: Which is your favorite (x, why?) Christmas comic?An older one? A newer one? A song or carol? A puzzle? I probably should have made an online survey ... but past experience tells me that I'll get fewer than 10 responses (likely much fewer).

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Here’s a free game to get you through the last couple days before vacation. Going into the next 2 days, I’m a little nervous about what is in store. I have had the kids in my Consumer Math classes for 3 years (Geometry, Algebra 2 and now Consumer Math as seniors) and we all know […]

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audi-vide-disce:
Incredible (

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It has been a busy quarter. Since August, I have made 10 trips, to conferences or to give colloquia. On 8 out of the 10 trips, I talked about a recent joint project with Sarah Koch and Alden Walker, on a topic in … Continue reading →

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12:21 AM | Reanimating the living world

Each year, Edge.org asks contributors to respond to their annual question. In 2014, the question was: What scientific idea is ready for retirement? There were 174 interesting responses, but one that got my attention was written by Scott Sampson (author, Dinosaur Odyssey: Fossil Threads in the Web of Life). The idea that Sampson would like [...]

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12:02 AM | Modulating the Permanent

When does it become hard to compute? Thomas Muir coined the term “permanent” as a noun in his treatise on determinants in 1882. He took it from Augustin Cauchy’s distinction in 1815 between symmetric functions that alternate when rows of a matrix are interchanged versus ones that “stay permanent.” To emphasize that all terms of […]

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12:00 AM | On This Day in Math - December 22

*WikScientists are the true driving force of civilization.~James BurkeThe 356th day of the year; There are 356 ways to partition the number 36 into distinct parts without a unit.EVENTS,1666 Seven mathematicians and seven physicists met at the king’s Library to inaugurate the French Academy of sciences. They would not receive a formal decree of protection from Louis XIV until 1699. For three centuries women were not allowed as members of the Academy. The first female full member was Yvonne […]

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Patrick Rubin-Delanchy and Daniel Lawson [of Warhammer fame!] recently arXived a paper we had discussed with Patrick when he visited Andrew and I last summer in Paris. The topic is the evaluation of the posterior predictive probability of a larger discrepancy between data and model which acts like a Bayesian p-value of sorts. I discussed […]

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10:30 PM | Share from Repository (weekly)

SelfiexploratorySome good data here for a Statistics project.. Explores the Selfie culture in a few different cities.Tags: no_tagNorth Korea Is Not Funny - The AtlanticTags: no_tagObfuscating "Hello world!" - Ben KurtovicTags: no_tagMIT Computer Scientists Demonstrate the Hard Way That Gender Still Matters | WIREDTags: no_tagJames Stewart devoted his life to math and music - The Globe and MailTags: no_tagPosted from Diigo. The rest of Read on the Web -- Repository group favorite links are here.

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10:22 PM | De delers van 496

De delers van 496:1x4962x2484x1248x6216x31De delers van 496 zijn: 1, 2, 4, 8, 16, 31, 62, 124, 248 en 496.1+2+4+8+16+31+62+124+248=496 1/1+1/2+1/4+1/8+1/16+1/31+1/62+1/124+1/248+1/496=2Check:-)

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10:18 PM | Class Opener – Day 74 – PolyGraphs

My 9th graders have only about 2 weeks left with me before their final exam. Most of them will move on to Algebra 2 next semester, so my strategy with them has been 2-pronged: ensure we are produtive with new … Continue reading →

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8:48 PM | Bijzondere methode

Via @... op twitter kwam ik deze bijzondere methode tegen om kwadratische vergelijkingen op te lossen: \( \eqalign{ & x^2 - 6x = 11 \cr & x(x - 6) = 11 \cr & ... \cr & (k - 3)(k + 3) = 11 \cr & k^2 - 9 = 11 \cr & k^2 = 20 \cr & k = \pm \sqrt {20} = \pm 2\sqrt 5 \cr & x = 3 \pm 2\sqrt 5 \cr} \) Maar daarover later meer... misschien...:-)

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8:12 PM | merry Yule!

altFiled under: Kids, pictures, Travel Tagged: celebrations, clouds, France, holidays, Montpellier, plane picture, sunrise, Yule

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8:00 PM | 12 Days of Christmas

Note: This post first appeared on Grey Matters in 2007. Since then, I've made it a sort of annual tradition to post it every December, with the occasional update. Enjoy!
Since the focus of this blog is largely math and memory feats, it probably won't be a surprise to learn that my favorite Christmas carol is The 12 Days of Christmas. After all, it's got a long list and it's full of numbers!
On

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References: Griffiths, David J. (2005), Introduction to Quantum Mechanics, 2nd Edition; Pearson Education, Section 3.6. Tom Lancaster and Stephen J. Blundell, Quantum Field Theory for the Gifted Amateur, (Oxford University Press, 2014), Section 3.5. There are a few results that will be used frequently in quantum theory that I think it’s worth collecting together and […]

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7:45 PM | National Mathematics Day

Exactly three years ago, on 22nd of December 2011 the then PM of India, Dr. Manmohan Singh announced in a major event at the University of Madras that 22nd of December would be celebrated as National Mathematics Day in India and 2012 as National Mathematics Year. This announcement came on the 125th birth year of

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7:38 PM | South Pole Communication

Introduction I find the subject of Antarctica very interesting and I read as much as I can about it – especially articles about the science begin done there. I recently was reading an article about Jerri Nielsen, a doctor who … Continue reading →

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7:16 PM | Sixth Dimension

Multilevel puzzle "Sixth Dimension" by Chris Yates
http://im-possible.info/english/art/applied_art/chris-yates.html#00-1
Author - https://www.flickr.com/photos/30135689@N05/

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6:49 PM | Plymouth workshops

The title refers not to buildings in the Royal Navy dockyard in Devonport, but to a London Mathematical Society regional meeting here last week. The format of the meeting was, on the first day, an LMS meeting with opportunity for … Continue reading →

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6:16 PM | Setting 2014 down

Happy holidays everyone! I hope you set 2014 down gently and meet 2015 with energy.Spurring by an offline conversation, let me add: Some people make the days of their lives and its instant decisions sound difficult, some infuse them with gravitas, yet others with visions of achievement, drama, seriousness, etc. I work very hard to package my grimed fingernails, sleepless sumping and sweat of research, work and relationships, submerge the package, stand on top of it, and sketch aparcus of fun,
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"A mathematician, like a painter or poet, is a maker of patterns. If his patterns are more permanent than theirs, it is because they are made with ideas."
Shane Shambhu as Ramanujan and David Annan as Hardy in the play A disappearing number. Photo: Tristram Kenton.read more

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4:19 PM | ha ha – Put to shame by my 8 year old.

We bought more Zometool pieces and have been playing around quite a bit with them lately. It is such a fun tool to help learn about 3D geometry. For example: Most of the stuff we’ve been building lately has used the blue struts, so we tried a special red strut challenge today for fun. I…

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Japan has been well-known for its high achievement in Mathematics, particularly in the Trends in International Mathematics and Science Study (TIMSS). I had been in Japan for the past one year and had been studying their curriculum, observing classes, as well as reading elementary school textbooks (yes, I can read and understand Japanese a bit.) Since some of […]
Math and Multimedia - School math, multimedia, and technology tutorials.

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Peter Swan writes: The problem you allude to in the above reference and in your other papers on ethics is a broad and serious one. I and my students have attempted to replicate a number of top articles in the major finance journals. Either they cannot be replicated due to missing data or what might […]
The post It’s Too Hard to Publish Criticisms and Obtain Data for Replication appeared first on Statistical Modeling, Causal Inference, and Social Science.

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MIT’s magazine Technology Review has a neat section in the back called “Puzzle Corner.” The section always has clever problems, though I’ve never thought to share one with the kids until seeing the most recent issue. It was problem N/D #3 that caught my attention this week: Link to the November / December Puzzle Corner…

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Apparently next january, on wednesday 21st, will be created a joint CNRS-IHÉS Laboratoire Alexander Grothendieck. That was fast! Several talks are being lined up, including one by Illusie titled “Remembering the SGA’S“. Registration is open until january 18th. Probably (and hopefully) all talks will then appear on the institute’s fine youtube channel.

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2:05 PM | Week 20

Ik heb op mijn website een scriptje staan dat steeds 3 'willekeurig' gekozen plaatjes geeft. Het script kiest daarbij steeds 3 plaatjes uit een verzameling van 24. Soms komen dezelfde plaatjes voor in het drietal. Hoe groot moet je verzameling zijn als je wilt dat de kans op drie verschillende plaatjes groter of gelijk aan 0,95 is?Oplossing week 20

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2:00 PM | Top Posts of 2014

Here are the most popular posts from MrHonner.com for 2014. When Desmos Fails Calculus Gave Me a Speeding Ticket The Last Digit of Your Age Is Mathematics Unnatural? Decomposing Functions Into Even and Odd Parts Fun With Self-Referential Tests

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Stupiti che 1 non sia primo? Scopriamo insieme perché è "solo" l'unità!Abbiamo già visto come, partendo dai numeri primi, si possa sviluppare un discorso più o meno approfondito sulle fondamenta matematiche. Altrettanto fondamentale, però, si rivela provare a rispondere alla domanda su quale sia il numero primo più piccolo. E', infatti, abbastanza noto come il numero 1 sia stato ora inserito ora escluso dalla lista dei numeri primi, ottenendo in alcuni casi lo status di più piccolo tra […]

Agargun A.G. & Fletcher C.R. (1997). The Fundamental Theorem of Arithmetic Dissected, The Mathematical Gazette, 81 (490) 53-57. DOI: http://dx.doi.org/10.2307/3618768

Crandall R. & Pomerance C.B. (2005). Primes!, Prime Numbers, Prime numbers: a computational perspective 1-82. DOI: http://dx.doi.org/10.1007/0-387-28979-8_1

Caldwell C.K. & Xiong Y. (2012). What is the smallest prime?, Journal of Integer Sequences, 15 arXiv: 1209.2007v2

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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

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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

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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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MindAfterMath tweeted: @MindAfterMath

2014-12-22 13:13:14

MindAfterMath tweeted: @MindAfterMath

RT @GoogleExpertUK: “Poor is the pupil who does not surpass his master.” ~ Leonardo da Vinci #quotes

2014-12-22 13:12:50

freakonometrics tweeted: @freakonometrics

"et si les universités n'avaient pas le droit de sélectionner les Masters 2 ?" http://t.co/qKg6D8BwhB (depuis le temps que je m'interroge)

2014-12-22 13:12:26

freakonometrics tweeted: @freakonometrics

"Le trading haute fréquence en chiffres" http://t.co/fDVV84U5GY par @NessimAitKacimi (mais attention aux chiffres http://t.co/HUFmgdSqOd)

2014-12-22 13:09:35

freakonometrics tweeted: @freakonometrics

"Somewhere else" is out http://t.co/NJ1Fds4qDM http://t.co/ztiV2yX5Rm

2014-12-22 13:05:54

michiexile tweeted: @michiexile

.@michiexile I mean… this is a demographics that does a LOT of moving around. Why dump heavy and single-use kitchen stuff on us!?

2014-12-22 13:03:54

michiexile tweeted: @michiexile

Got my office christmas gift. A mustard mill. Seems weird to hand out a 4kg chunk of cast iron with a single use to university employees…

2014-12-22 13:03:18

rmathematicus tweeted: @rmathematicus

RT @HistorianJen: They are called Imperfect Men: Impotence, Infertility and Hernias. My new article http://t.co/uj2DmSrapW … #earlymodern #…

2014-12-22 13:02:54

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