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# Posts

### December 21, 2014

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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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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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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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12 / 2 = 1 + 1 + 4 Also: 12 * 2 * 1 * 1 = 4! Also: 12 / (2 + 1) = 1 * 4 Also: 1 + 2 + 2 = (1 * 1) + 4 Also: (1 * 2) + (2 * 1) = 1 * 4
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تصحيح تمرين13 حول دراسة الدوال وتمثيلها المبياني  في ما يلي، تصحيح التمرين رقم 13 حول درس "دراسة الدوال العددية وتمثيلها المبياني" للثانية بكالوريا علوم فيزيائية ورياضية، وهدا التمرين يشمل النهايات والاشتقاق والفروع اللانهائية ثم انشاء المنحنى. اسئلة التمرين 13 حول دراسة […]
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An Inequality Involving Fermat Point
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Inequalities in Triangle
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Bounds for the Sum of Distances to the Vertices
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The unexplained mystery..."I, for one, find Gödel's incompleteness theorems rather comforting. It means that mathematicians will never be complete. There will always be something else which is undecidable with the current axioms. Should the human species survive another few million years and continue churning out mathematics at the rate we've done for the past few thousand years, we still won't have considered it all. There will always be work for all of the future mathematicians. As always, […]
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He preparado un documento PDF con una clave de soluciones a problemas seleccionados del tema 5 que se puede descargar de este enlace.
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Konijn met de feestdagen? 55% kans dat een Nederlands konijn uit deze 10 gemeenten komt.Hoeveel konijnen zijn er eigenlijk in Nederland?
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Originally posted on Tuition Database Singapore:Hi Readers, Are you looking for a printable 2015 Calendar, specially tailored for Singapore? Check out this PDF printable 2015 calendar: Calendar (Generated by http://www.calendarlabs.com/pdf-calendar.php) Happy new year! Featured book: Chicken Soup for the Soul: Think…
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Source: Sent to me by Pritish Kamath (http://www.mit.edu/~pritish/) Problem: Have you ever played "SET"? You have to play it. http://www.setgame.com/learn_play http://www.setgame.com/sites/default/files/Tutorials/tutorial/SetTutorial.swf Even if you have not played the game, the game can be stated in a more abstract way as follows: There are 12 points presented in F34 and the first person to observe a "line" amongst the 12 given points gets a score. Then the 3 points forming […]
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$$p / ( p-1 ) ! + \left(\frac{a}{p}\right) a^{(p-1)/2}$$Proof.Consider the equation $Ax \equiv a \bmod p$ with $A, x \in \{ 1,2, \cdots p-1\}$,Case $\left(\frac{a}{p}\right)=-1$In this case $x$ and $A$ are different members of the set $\{ 1,2, \cdots p-1\}$, there are $(p-1)/2$ distinct pairs $(A, x)$ and pairwise multiplication gives the following identity: $( p-1 ) ! = a^{(p-1)/2}$.Case $\left(\frac{a}{p}\right)=1$In this case $a$ is a quadratic residue of $p$ so there are two pairs […]
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Hola a todo el mundo! Aquí tenéis mi aportación para esta edición del Carnaval: http://elmundoderafalillo.blogspot.com.es/2014/12/arcos-de-malaga-rebajado.html Espero que os guste ;)
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Hello and welcome to my 19th gems post. This is where I share some of the best teaching ideas I've seen on Twitter each week. Most of my gems have come from across the Atlantic today, inspired by our mathematical friends in America. 1. Polygraph There's been a lot of buzz about Desmos' new Polygraph activities. They're mathematical versions of Guess Who, designed to 'foster the pleasure and
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So says the what’s new page. How close have they come to yymm.9999 to warrant this? Well, in september, the post-holidays peak, it got to 1409.8676 (found this by dichotomy, maybe there’s a more clever way).  Actually, in october it went even higher to 1410.8871, while in november it receded a bit to 1411.8006. All […]
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The theory of solving equations of fifth and sixth degree didn’t end when Abel proved the impossibility of solving the general algebraic equation of fifth degree or higher. Here is Cole (for whom the Cole Prize is named) recounting the … Continue reading →
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We are pleased to upload the Mathematical Sciences question papers for SET 2014, conducted by SLET Commission, Assam.   Paper I Paper II Paper III   [The member state of the Commission are Assam, Arunachal Pradesh, Mizoram, Meghalaya, Manipur, Sikkim and Tripura.]
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Last week’s post on “Coding Christmas” has been very popular; my personal favourite use of Scratch is to demonstrate relationships between angles and polygons which I have written on before. Investigating more projects on Scratch I found What’s My Number? which could make … Continue reading →
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Diederik Stapel’s book, “Ontsporing” has been translated into English, with some modifications. From what I’ve read, it’s interesting in a bizarre, fraudster-porn sort of way. Faking Science: A true story of academic fraud Diederik Stapel Translated by Nicholas J.L. Brown Nicholas J. L. Brown (nick.brown@free.fr) Strasbourg, France December 14, 2014 Foreword to the Dutch edition […]
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Quando non ti ricordi cosa c'è dopo l'uno, il tre è molto lontano Fred (d'Alembert) Bene, sembra siate passati attraverso moltiplicazione e divisione senza eccessivi traumi. Ancora un passettino, dai: carta & matita. Calcolate la radice quadrata di duecentosessantaquattro. Sino al secondo decimale. Non ditemi che non vi ricordate... Incredibile! Già, anche in età più tarda ci si scontra con [...]
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Retour sur les triangles de Steinhaus équilibrés et le problème de Molluzzo … - Les conjectures du trimestre / Piste rouge, featured
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Long time ago, I talked about conformal changes for various geometric quantities on a given Riemannian manifold of dimension , see this post. Frequently used in conformal geometry in general, or when solving the prescribed scalar curvature equation in particular, is the conformal Laplacian, defined as follows where is the scalar curvature of the metric […]
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Today's insights go in different directions. The first one came in large part from a remark by John Platt on  Technet's Machine Learning blog who puts this into words much better than I ever could....Given the successes of deep learning, researchers are trying to understand how they work. Ba and Caruana had a NIPS paper which showed that, once a deep network is trained, a shallow network can learn the same function from the outputs of the deep network. The shallow network can’t learn […]
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I have given you a lot of gift ideas for Christmas (Christmas Presents, for her, for him, for children), but I thought that it would be a good idea to do a DIY. Also, this is not a really maths … Continue reading →