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# Posts

### April 19, 2015

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Bikes . . . have “become the most common mode of transportation for criminals.” OK, that’s just ethnic profiling of Dutch people. I think they’re just gonna put the whole country on lockdown. The post Diederik Stapel in the news, again appeared first on Statistical Modeling, Causal Inference, and Social Science.
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The Sydney Morning Herald published the following article: http://www.smh.com.au/nsw/confronting-campaigns-cast-light-on-hidden-victims-of-household-violence-20150418-1mmls2.html telling the story of a 14 year old girl who "wants the NSW government to know that if domestic violence had... http://www.harnwell.org/
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spacepetals: Mobius transformation as rigid motion of the Riemann sphere. Animation made in Mathematica. code can be found here Check out Möbius Transformations Revealed by Douglas Arnold and Jonathan Rogness. This video was one of the winners of the 2007 Science and Engineering Visualization Challenge. So awesome. :D
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Rajesh Kumar ThakurRajesh Kumar Thakur currently works as a Director at the National Vedic Maths Academy, a branch of the All India Ramanujan Maths Club, Gujarat. He has been teaching secondary and senior secondary school students for the past 14 years and has written more than 30 books and around 100 mathematical articles and dozens of research papers in national and international journals. To popularize Vedic Mathematics, he has thus far conducted more than 250 seminars in […]
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Can you earn a living just from blogging?

### April 18, 2015

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This week we celebrated Euler’s birthday on 15th and I thought I need to write something about him. In my (almost) 4 years of university I have heard his name a lot of time. And this is a thing especially because at most of my courses the teachers don’t say anything about the mathematicians that […]
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People must understand that science is inherently neither a potential for good nor for evil. It is a potential to be harnessed by man to do his bidding.~Glenn T. SeaborgThe 109th day of the year; 109 is a twin prime with 107. I just found out that the product of twin primes (greater than 5) will have a digit root of 8.. 5 * 7 = 35, 3 + 5 = 811 * 13 = 143, 1 + 4 + 3 = 817 * 19 = 323, 3 + 2 + 3 = 8 Hat tip to Ben Vitale 109 = 1*2+3*4+5*6+7*8+9.The period of the reciprocal of 109 ends […]
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Dylan Kane (@math8_teacher) just posted this photo on twitter a few hours ago. It's the first sighting of Playing with Math in a crowdfunder's hand! We got a message from one more crowdfunder a few minutes later that her copy had arrived. The books are coming!My living room has stacks of books along one wall, sent to me by the publisher. I signed and repacked about twenty of them this morning, to send out to our \$100 and over contributors.It is so exciting to know the book is finally in […]
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Choisissez une partie quelconque du plan. A cette partie, on peut lui appliquer deux types d’opérations: Soit on prend son complémentaire; Soit on prend sa fermeture (au sens topologique du terme). Pour ceux qui ne sauraient pas vraiment ce que … Continuer la lecture →
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Filed under: pictures, Running, Travel, University life Tagged: Amsterdam, architecture, coffeehouse, Holland
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Tracy Zager gave my favorite talk at NCTM, and it is the talk that has kept me thinking the most. Tracy spoke at Shadow Con with the title “Breaking the Cycle”. Tracy works with pre-service elementary teachers, and when interviewed 63% of them revealed negative associations with math. When she took their descriptions of their […]
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Last month I presented a workshop at the National Mathematics Teacher Conference (#mathsconf2015) entitled 'Tricks and Tips: Clever Methods for Explaining Mathematical Concepts'. This is the third in a series of posts summarising the content of that workshop for those who were unable to attend. The aim of my workshop was to encourage people to reflect on their subject knowledge and the
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I visited my son’s first grade class the other day, and brought along a branch I found in our yard debris pile.  The kids didn’t take long to realize the big branch was made from smaller branches, which were made from still smaller branches.  After establishing that a self-similar shape like that is known as a fractal, we set about making our own using a template I made. (The template has two equilateral triangles with vertices and midpoints marked, just to get everyone […]
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Font by Etienne Vles   http://im-possible.info/english/art/misc/fonts/etienne-vles.html   Author - http://www.etiennevles.com/
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Photo by Michael Phillips (Mikeyp2000)   http://im-possible.info/english/art/sculpture/michael-phillips.html   Author - https://www.flickr.com/people/mikeyphillips/
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Readers, Aunt Pythia has an amazing guest philosopher here with her today in sunny Berkeley, a paradise on earth and home to the Kouign Amann: His name is Aristippus, and he claims to be the inventor of hedonism. We’ll be the judges of that, though, shall we? His philosophy dictates a lifestyle in which he […]
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“Tests of Statistical Hypotheses and Their Use in Studies of Natural Phenomena” by Jerzy Neyman ABSTRACT. Contrary to ideas suggested by the title of the conference at which the present paper was presented, the author is not aware of a conceptual difference between a “test of a statistical hypothesis” and a “test of significance” and uses […]
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"Hoeveel getallen van 5 verschillende cijfers bevaten 2 even en 3 oneven cijfers? (het meest linkse cijfer is nooit 0)"Oplossing week 17
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Here is the video: Towards a Learning Theory of Causation by David Lopez-Paz, Krikamol Muandet, Bernhard Schölkopf and Iliya TolstikhinWe pose causal inference as the problem of learning to classify probability distributions. In particular, we assume access to a collection {(Si,li)}ni=1, where each Si is a sample drawn from the probability distribution of Xi×Yi, and li is a binary label indicating whether "Xi→Yi" or "Xi←Yi". Given these data, we build a causal inference […]
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Reference: Carroll, Bradley W. & Ostlie, Dale A. (2007), An Introduction to Modern Astrophysics, 2nd Edition; Pearson Education – Chapter 2, Problems 2.4-2.5. For two masses and interacting via gravity, it’s easiest to do calculations in the centre of mass frame. The position of the centre of mass is defined as where is the position […]
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Meet the mathematics professor behind 'Cheryl's birthday' puzzle: Chew Hui Min:The man behind the “Cheryl’s birthday” viral poser is a mathematics professor from the National Institute of Education (NIE).Dr Joseph Yeo Boon Wooi, who is in his 40s, is part of the panel for the Singapore and Asian Schools Math Olympiads (SASMO), the largest math competition here.
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If you’re in New Haven next week, you could do worse than checking out this talk at Yale’s CS Colloquium by my stellar PhD student Mahdi Zamani.
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Sometimes, it's always nice to get a context on certain things that happened in the past. Here are three biographies that I have read recently and which fits that bill.Kenneth Case, known for his singular eigenfunction workCharles W. Johnson, the person behind IMSLLeo Breiman, of the Random Forest fame.   Join the CompressiveSensing subreddit or the Google+ Community and post there ! Liked this entry ? subscribe to Nuit Blanche's feed, there's more where that came from. You can […]
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C: \$K_A m; \\ K_B d.\$ A: \$\neg K_A d; \\ m \vDash \neg K_B m.\$ B: \$d \not\vDash K_B m; \\ (K_A(\neg K_B m)) \vDash K_B (m,d).\$ A: \$m \wedge K_B(m,d) \vDash K_A (m,d).\$ Albert, Bernard and Cheryl have had a busy week. They’re the stars of #thatlogicproblem, a question from a Singapore maths test... Read more »
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Due settimane fa siamo andati nel paradiso delle biciclette. E dopo un giro veloce di considerazioni, di consigli e di guida sulla pista ho deciso quale sarebbe stata l'erede di Dulcinea. Ed ecco a voi Dulcinea II! In tutta la sua scura bellezza.Come catena scoraggia-ladri mi hanno consigliato questa a metro di muratore. Dice che è una delle più resistenti. Ma ho già trovato un video in cui viene spezzata con un frullino. In quest'altro video però sembra essere davvero una delle […]
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Nobody’s going to win all the time. On the highway of life you can’t always be in the fast lane (Haruki Murakami, What I Talk About When I Talk About Running) I started running two years ago and one if my dreams is to run a marathon someday. One month ago I run my first … Continue reading Analysing The Rock ‘n’ Roll Madrid Marathon →
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The week at Retraction Watch featured the retraction of 11 papers by a controversial researcher in Italy, and a look at the controversy over lead in the water supply. Here’s what was happening elsewhere: “How Australian scientists are bending the rules to get research funding.” “[S]ome current attempts to upgrade or otherwise modify the peer-review […]The post Weekend reads: Aussie scientists bend rules; how to fix peer review once and for all; crazy structure […]
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Il giocatore di Planescape: Torment interpreta un personaggio che si risveglia su un pianeta sconosciuto senza alcuna memoria sulla sua identità o sui suoi ricordi. Le missioni che il videogioco gli proporrà saranno un percorso per recuperare i ricordi perduti. E' la stessa situazione in cui si trova Verloc, che si sveglia con immagini confuse nella testa mentre un gorilla robotico che fuma un sigaro, Churchill, gli viene incontro contento che sia sopravvissuto a una ignota impresa. Per […]
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Tous les mercredi, à la Maison des Mathématiques et de l'Informatique (à Lyon), un exposé de mathématiques ludique, original et détendant. Et parfois, un carnet de route... (Vous pouvez retrouver les autres carnets de route ici.) C'est ici pour télécharger le fichier pdf, et là pour en savoir plus sur le séminaire de la détente et la MMI. - Billets des habitués / Carnets de route
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I was talking with someone today about various “dead on arrival” research programs we’ve been discussing here for the past few years: I’m talking about topics such beauty and sex ratios of children, or ovulation and voting, or ESP—all of which possibly represent real phenomena and could possibly be studied in a productive way, just […] The post How do data and experiments fit into a scientific research program? appeared first on Statistical Modeling, Causal […]