Mathblogging.orgRecent Postshttp://www.mathblogging.org/scripts/feed.php2014-04-23T12:12:52-04:00No copyright asserted over individual posts; see original posts for copyright and/or licensing.Mathblogging.org Atom serializerBook review: Vedic Mathematicshttp://www.mathblogging.org/post/857492014-04-23T05:00:00-04:00ColinI wanted – I really, really wanted – to like this book. On the surface, it’s exactly my cup of tea: a whole book of tricks to make mental arithmetic easy. Sadly, there’s so much about it that’s dreadful that the nuggets inside it are hardly worth the effort. The binding? Dreadful1. The printing? Dreadful. The layout? Dreadful. The explanations? Negligently dreadful. The content? Occasionally intriguing, but often dreadful. The cover? Dreadful. Not all sayings, it
[…]A short questionnaire regarding the subjective assessment of evidencehttp://www.mathblogging.org/post/857452014-04-23T04:08:47-04:00AndrewE. J. Wagenmakers writes: Remember I briefly talked to you about the subjective assessment of evidence? Together with Richard Morey and myself, Annelies Bartlema created a short questionnaire that can be done online. There are five scenarios and it does not take more than 5 minutes to complete. So far we have collected responses from […]The post A short questionnaire regarding the subjective assessment of evidence appeared first on Statistical Modeling, Causal Inference, and Social
[…]Algunas recomendaciones matemáticas para el Día Internacional del Libro 2014http://www.mathblogging.org/post/857472014-04-23T04:00:07-04:00^DiAmOnD^Como todos los años desde 1995, hoy día 23 de abril se celebra el Día Internacional del Libro. Por ello, creo que es el mejor momento para recomendaros algunos libros relacionados con las matemáticas que creo que pueden ser interesantes para vosotros. Ahí van: Los Simpson y las Matemáticas Curioso libro en el que Simon […]Entra en Gaussianos si quieres hacer algún comentario sobre este artículo, consultar entradas anteriores o enviarnos un mensaje.<br><br>Construye tú
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[…]Premio #CarnaMat52http://www.mathblogging.org/post/857422014-04-23T03:37:16-04:00UnknownDurante la pasada Semana Santa finalizó el plazo para otorgar el Premio a la mejor entrada de la Edición 5.2 Emmy Noether del Carnaval de Matemáticas. Quizás ese ha sido uno de los motivos por los que en esta ocasión no hay muchos votos. En cualquier caso, ya hemos procedido al recuento y, por segunda vez, no hay uno sino dos ganadores de la presente edición.<br /><br />Y los ganadores, con 8 puntos repartidos en 2 votos de 4 puntos cada uno, son<br /><br /><br />Un puzzle sencillo (del Cuaderno de Cultura
[…]My mobile number is a prime numberhttp://www.mathblogging.org/post/857462014-04-23T03:34:47-04:00Gaurav TiwariMy personal mobile number 9565804301 is a prime number. What is a prime number? Any positive integer p greater than 1 is called a prime number if and only if its positive factors are 1 and the number p itself. In other words, the natural numbers which are completely… Continue readingVisit the original post My mobile number is a prime number for the best experience of reading!Hundeerziehung ist wie…http://www.mathblogging.org/post/857412014-04-23T03:20:21-04:00Jan-Martin KlingeZwischen Umzug und Umbau darf auch unser kleiner Hund nicht zu kurz kommen. Ich bin einigermaßen stolz auf die Erziehung, kann sie doch inzwischen neben den ganzen Basics auch so Kunststückchen wie “auf Kommando” pinkeln (das war wichtig, weil sie abends manchmal gar keine Lust hat, auf die Wiese zu … weiterlesen → 8940http://www.mathblogging.org/post/857382014-04-23T02:30:00-04:00Mathematical Association of America8940 = 2 x 2 x 3 x 5 x 149.<br /><br />8940 is 3388 in base 14.<br /><br />8940 is a number n such that n + 1, 2n + 1, and n2 + 1 are primes (A236692).<br /><br />8940 is the number of subsets of {1, 2, . . ., 38} containing 38 and having less than or equal to nine pairwise coprime elements (A186993).<br /><br />8940 is the number of arrays of squares of integers, symmetric under 90-degree rotation, with all rows summing to 2 (A156411).<br /><br /><br />Source: OEISMemorizing Trig's Functions?http://www.mathblogging.org/post/857712014-04-23T02:07:10-04:00UnknownHere's what you need to help you commit Trig's functions to memory. It's called Alison's Triangle and was found in the book 'Twenty Years Before the Blackboard' which was written by who else of course? A math teacher!...Read Full PostHavel-Hakimi, Temari, and more GIFShttp://www.mathblogging.org/post/857402014-04-23T01:11:35-04:00Paul SalomonWelcome to this week’s Math Munch! We’ve got another great game for you, a followup with Temari artist Carolyn Yackel, and some mind-blowing math gifs. First up, a nice little graph theory game created by Jacopo Notarstefano. The game is about whether or not sets of numbers meet the conditions for being “graphical.” Maybe the best […]A Convergence of Interests: IEEE SP Mag, COLT2014 and more...http://www.mathblogging.org/post/857372014-04-23T01:00:00-04:00IgorI don't know if this is a sign of times, but this Sunday Morning Insight'entry entitled Why You Should Care About Phase Transitions in Clustering got 35+ Google recommendations. It's a record as far as this blog is concerned. Why a sign of times ? because I think in the same way we see a convergence between sensing and machine learning, there seems to be a similar convergence in themes related to the general topic of advanced matrix factorizations in theoretical computer
[…]The Shape of Informationhttp://www.mathblogging.org/post/857392014-04-23T00:44:00-04:00Suresh VenkatasubramanianA brief synopsis of my general-audience talk at Haverford College. <br /><br />I'm currently visiting Haverford College at the invitation of +Sorelle Friedler as part of Haverford's big data lecture series. Today's talk was a general audience talk about data mining, titled 'The Shape Of Information': (GDrive link)<br />The Shape Of Information What makes data mining so powerful, and so ubiquitous? How can the same set of techniques identify patients at risk for a rare genetic disorder,
[…]Transit of Atlantis and Hubble in front of the Sun - Thierry Legaulthttp://www.mathblogging.org/post/857352014-04-23T00:16:00-04:00UnknownOnly image ever taken of a transit of a space shuttle (Atlantis) and the Hubble Space Telescope (HST) in front of the Sun.Teaching and Coachinghttp://www.mathblogging.org/post/857322014-04-22T23:34:05-04:00jnewman85I’m convinced that I’m a worse teacher during tennis season, while I coach. The students & parents came to me about a year and a half ago having heard that I played tennis back in high school, “so you can … Continue reading →12gon:
cluster 4hedral / 8hedral honeycombhttp://www.mathblogging.org/post/857342014-04-22T22:55:02-04:00Unknown12gon:
cluster 4hedral / 8hedral honeycomb
The future of mathhttp://www.mathblogging.org/post/857192014-04-22T21:49:17-04:00ChristopherNothing important here. But in case you’re into this sort of thing, we had some fun on Twitter this morning imagining the future of math. Click on through if you like.  Skip-Counting...It Ain't Just 2s, 5s, and 10s!http://www.mathblogging.org/post/857202014-04-22T21:48:00-04:00Donna BoucherSo, I'm doing oral administration of state testing today and tomorrow, and that gives me a lot of time to think about math. And connections. And ways to help kiddos make connections. Which brings me to skip-counting.<br /><br />Skip-counting shows up in the CCSSM in a couple of places:<br />K.CC.1--Count to 100 by ones and by tens2.NBT.2--Count within 1000; skip-count by 5s, 10s, and 100s And that's basically it. As far as I can tell, there's not even a standard for skip-counting by […]Students learn to give feedback with a growth mindsethttp://www.mathblogging.org/post/857182014-04-22T21:13:47-04:00Mary DoomsYesterday Algebra’s Friend introduced me to a new professional development blog Read…Chat…Reflect…Learn! While I enjoy reading blogs for lesson ideas, I also love reading journal and magazine articles, books, research studies, etc. as another way to stay current. I’m glad I found this blog and I’m thrilled to see that it’s in its infancy, only because it makes […]Drawing Pictures: Reflections on Problem Solvinghttp://www.mathblogging.org/post/857212014-04-22T20:27:00-04:00Sarah HaganThe more I teach, the more I learn. Eventually, I'm going to become pretty great at this job. <br /><br />The summer before my first year of teaching, I made a set of problem solving strategy posters to hang on the wall. My first year of teaching, these posters had an entire bulletin board dedicated to them. I would occasionally reference them in class, but I didn't really do anything substantial with them. <br /><br />Problem Solving Strategies Bulletin BoardThis summer, I redecorated and […]allofthemath:
This, ladies and gentlemen and genderqueer folks,...http://www.mathblogging.org/post/857032014-04-22T20:10:18-04:00Unknownallofthemath:
This, ladies and gentlemen and genderqueer folks, is Pascal’s tetrahedron, a three dimensional analogue of Pascal’s triangle, and it’s pretty freaking great.
I’ve never heard of this before!tigburr:
coolmathstuff:
allofthemath:
appliedmathemagics:
the...http://www.mathblogging.org/post/857042014-04-22T20:07:53-04:00Unknowntigburr:
coolmathstuff:
allofthemath:
appliedmathemagics:
themathkid:
Can’t. Stop. Watching.
this is hypnotic…
Conic sections are all connected! A hyperbola is an anti circle, in this case.
Remember, the equation for a circle involves adding x squared and y squared, while the equation for a hyperbola involves subtracting one from the other. The other consequence of this is that is that if you extend the graph of either one to include imaginary and complex x or y values, a hyperbola
[…]On This Day in Math - April 23http://www.mathblogging.org/post/857052014-04-22T19:30:00-04:00Pat Ballew<br />"Whatever is worth saying,<br />can be stated in fifty words or less"<br />~ Stanislaw Ulam *bt (before twitter)Thanks to @cytiaB for this one<br /><br />The 113th day of the year; 113 is prime, its reversal (311) is prime, and the number you get by any reordering of its digits is still prime. Students might try to find other of these "absolute" or "permutable" primes.<br />Also the sum of the first 113 digits of e is prime. That was also true of yesterday's number, and tomorrow's. (I was just wondering to myself, what is […]Decisions to be taken in April 2014http://www.mathblogging.org/post/857002014-04-22T19:12:47-04:00ems_solidarityThis is a copy of the message sent to the Committee members by e-mail on April 23:
From: Carles Casacuberta<br />
Sent: Wednesday, April 23, 2014 1:04 AM<br />
To: lucian.beznea@imar.ro ; matej.bresar@fmf.uni-lj.si ; adoro@imath.kiev.ua ; vladad@mi.sanu.ac.rs ; fiala@kam.mff.cuni.cz ; yulij@math.cornell.edu ; s.jackowski@mimuw.edu.pl ; krichev@math.columbia.edu ; fn8@mcs.le.ac.uk ; sergeev@mi.ras.ru<br />
Subject: EMS Committee for European Solidarity
Dear Friends,
According to the rules that we agreed for our
[…]Earth Day Trash or Cafeteria Treasure?http://www.mathblogging.org/post/857332014-04-22T19:10:12-04:00Megan SchmidtI had intentions of scouring the internet for the perfect Earth Day activity. Luckily, I came across this: I saw Beyond Traditional Math’s lesson on the Pacific Garbage Patch, and more than anything, I was impressed with his work and inspired to learn more about this floating mass of plastic-y mess twice the size of Texas […]TP and Taxi Ratehttp://www.mathblogging.org/post/857072014-04-22T18:46:25-04:00fawnnguyenThis jumbo roll of Charmin 2-ply toilet paper made me think about area, and I wonder if my kids know how to convert from one square unit to another. I suspect they will do this incorrectly.<br><br><br>Before I ask them to calculate the area of 1 roll, I ask them to:estimate the number of sheets in 1 rollestimate the dimensions, in inches, of 1 sheetcalculate the total area, in square inches, of 1 roll based on your estimations aboveTheir estimates for the number of sheets range from 123 to 15,000. The
[…]Activity - Atlantis and Hubble in front of the Sunhttp://www.mathblogging.org/post/857062014-04-22T18:35:00-04:00UnknownIf we can determine the altitude of a plane in front of the moon, why not try the altitude of the Space Shuttle Atlantis in front of the Sun?A helpful structure for analysing graphshttp://www.mathblogging.org/post/857012014-04-22T18:18:03-04:00Dr NicMathematicians teaching English “I became a maths teacher so I wouldn’t have to mark essays” “I’m having trouble getting the students to write down their own ideas” “When I give them templates I feel as if it’s spoon-feeding them” These … Continue reading →AISTATS 2014 (day #1)http://www.mathblogging.org/post/857022014-04-22T18:14:36-04:00xi'anFirst day at AISTATS 2014! After three Icelandic vacations days driving (a lot) and hinkg (too little) around South- and West-Iceland, I joined close to 300 attendees for this edition of the AISTATS conference series. I was quite happy to be there, if only because I had missed the conference last year (in Phoenix) and […]GlobalSIP14: CFP for Information Processing for Big Datahttp://www.mathblogging.org/post/856992014-04-22T18:01:00-04:00IgorYuejie Chi just sent me the following:<br /><br />Dear Igor, I'm a follower of your blog and appreciate your consistent contribution to the research community..... I am writing to ask if you could kindly advertise our GlobalSIP symposium on "Information Processing for Big Data" on your blog. The symposium contains three tracks - all of them are related to high-dimensional data but with different focuses. Laura Balzano, Yao Xie and I are co-organizing the track on "Subspace Methods for
[…]Συνέχεια και τοπικά ακρόταταhttp://www.mathblogging.org/post/856962014-04-22T17:51:45-04:00Mihalis KolountzakisΕίναι πολύ εύκολο να φτιάξει κανείς μια συνάρτηση που να έχει τοπικό ελάχιστο σε κάθε πραγματικό αριθμό και να μην είναι σταθερή (π.χ. η χαρακτηριστική συνάρτηση του διαστήματος ). Υπάρχει ή όχι συνεχής μη σταθερή συνάρτηση που να έχει τοπικό ελάχιστο σε κάθε πραγματικό […]Don't Beware of Math... Be Aware of It!http://www.mathblogging.org/post/856942014-04-22T17:31:19-04:00Tim ChartierThere is a certain sense of mystery to math. You step into a question and simply stand in the unknown. Then you begin to explore, looking for pieces that fit together. This type of thinking is helpful for life, as it offers its unknowns.