Mathblogging.orgRecent Postshttp://www.mathblogging.org/scripts/feed.php2015-03-02T13:57:11-05:00No copyright asserted over individual posts; see original posts for copyright and/or licensing.Mathblogging.org Atom serializer[DMANET] Opt4SmartCities workshop at CPAIOR, May 2015 Barcelonahttp://www.mathblogging.org/post/1128922015-03-02T05:19:00-05:00Lance Fortnow                             Call for Papers<br>                Workshop on Optimization for Smart Cities                             Opt4SmartCities<br>                             <br>               </br>
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[…]More Studies that Tech Handouts Hurt Studentshttp://www.mathblogging.org/post/1128722015-03-02T05:00:00-05:00DeltaFrom an Op-Ed in the New York Times on 1/30/15 by Susan Pinker, a developmental psychologist:<br />In the early 2000s, the Duke University economists Jacob Vigdor and Helen Ladd tracked the academic progress of nearly one million disadvantaged middle-school students against the dates they were given networked computers. The researchers assessed the students’ math and reading skills annually for five years, and recorded how they spent their time. The news was not good.<br /><br />“Students who gain access to
[…]Dividing by 63http://www.mathblogging.org/post/1128732015-03-02T05:00:00-05:00ColinAt a recent MathsJam, @brownmaths — who really should have known better — showed up with a calculator. Dear oh dear. His excuse was that it was in his teaching satchel, and he sometimes needed it to work out trigonometric functions (the Mathematical Ninja rolled his eyes, but I said fair enough) or “If there’s a test and it’s out of 63, and I need to work out the percentages…” “Divide by 7, then by 9″ was the obvious response from the
[…]Edición 6.1 Números perfectos del Carnaval de Matemáticas: El Resumenhttp://www.mathblogging.org/post/1128692015-03-02T04:59:15-05:00Unknown <br />¿Alguna vez te has desesperado en un cruce de semáforos, sospechando que el tuyo tarda demasiado en ponerse verde?<br />Ningún mapa mundi es perfecto<br />No es la primera vez que hablamos del físico y diseñador Tom Beddard<br />Hay mucha gente que dice que la ciencia es una cosa muy seria<br />La semana pasada presenté en el blog La Extraordinaria Química de la Universidad de Oviedo<br />Comencemos con una cuestión simple: ¿qué es un percentil? <br />Tres jugadores entran en una habitación<br />El escritor Stefan
[…]Project NExThttp://www.mathblogging.org/post/1129182015-03-02T04:56:19-05:00UnknownProject NExT Fellows join an active community of faculty who have gone on to become award-winning teachers, innovators on their campuses, active members of the MAA, and leaders in the profession. New and recent Ph.D.s are encouraged to apply to join the 2015 cohort of Project NExT Fellows by April 15. Additional information can be found at projectnext.maa.org.
[DMANET] CIAC 2015: CALL FOR PARTICIPATIONhttp://www.mathblogging.org/post/1128932015-03-02T04:51:00-05:00Lance Fortnow9th International Conference on Algorithms and Complexity (CIAC)<br>May 20-22, 2015, Paris, Francehttp://www.lamsade.dauphine.fr/~ciac2015/cfp.phpThe 9th International Conference on Algorithms and Complexity is<br>intended to provide a forum for researchers working in all aspects of<br>computational complexity and the use, design, analysis and<br>experimentation of efficient algorithms and data structures.Accepted papers presente original research in the following areas of<br>algorithms and<br>complexity:
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[…][DMANET] EUROCOMB 2015http://www.mathblogging.org/post/1128942015-03-02T04:34:00-05:00Lance FortnowThe European Conference on Combinatorics, Graph Theory and
<br>Applications will be held in Bergen, Norway, Aug 31 - Sep 4, 2015.
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<br>Please visit the EuroComb 2015 webpage for the Call for Papers:
<br>http://eurocomb2015.b.uib.no/call-for-papers/
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<br>The Conference poster can now be downloaded.
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<br>Abstract submission deadline is March 15th.
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[…]Les darreres aparicions de Sangakoo als mitjanshttp://www.mathblogging.org/post/1128712015-03-02T04:26:03-05:00SangakooEl mes de febrer ha estat un mes molt productiu per Sangakoo. Durant els dies 12 i 13 de febrer, diversos mitjans de comunicació van fer-se ressó de la nostra plataforma d’aprenentatge col·laboratiu. Podeu escoltar l’entrevista que ens varen fer a Ràdio 4, al programa El Matí, tot clicant aquí. (minut 33).     O […]Equilateral Triangle on a Closed Curvehttp://www.mathblogging.org/post/1129152015-03-02T04:23:43-05:00UnknownFor a closed simple curve, there are always three points lying on the curve that form an equilateral trianglehttp://www.mathblogging.org/post/1129162015-03-02T04:23:43-05:00UnknownMr Barton Startershttp://www.mathblogging.org/post/1128702015-03-02T04:20:00-05:00solvemymathsThe mighty Craig Barton has a bunch of great ideas for starters on his ace website. I like lots of them, particularly the operations table stuff (pictured).catch my post at the Wiley Exchanges bloghttp://www.mathblogging.org/post/1128682015-03-02T04:17:22-05:00Peter KrautzbergerIt’s been quiet around here — too much work behind the scenes — BUT you can still read some of my usual incessant babbling over at the Wiley Exchanges Blog where I write about MathML and its role in Making …How do we protect ourselves from cybercrime?http://www.mathblogging.org/post/1128662015-03-02T03:30:29-05:00CharleyModern society requires a reliable and trustworthy Internet infrastructure. To achieve this goal, cybersecurity research has previously drawn from a multitude of disciplines, including engineering, mathematics, and social sciences, as well as the humanities. Cybersecurity is concerned with the study of the protection of information – stored and processed by computer-based systems – that might be vulnerable to unintended exposure and misuse. The post How do we protect ourselves from
[…]Curve Envelopehttp://www.mathblogging.org/post/1128672015-03-02T03:30:00-05:00solvemymathsvia MathGifsSilhouetteshttp://www.mathblogging.org/post/1128652015-03-02T02:00:55-05:00aschinchonRomeo, Juliet, balcony in silhouette, makin o’s with her cigarette, it’s juliet (Flapper Girl, The Lumineers) Two weeks ago I published this post for which designed two different visualizations. At the end, I decided to place words on the map of the United States. The discarded visualization was this other one, where I place the words over the silhouette … Continue reading Silhouettes →Night at the Museum: Secret of the Tomb (2014)http://www.mathblogging.org/post/1128642015-03-02T01:33:00-05:00teuku firmansyahFull Streaming Night at the Museum: Secret of the Tomb in Top Video FormatNow you can watch full Night at the Museum: Secret of the Tomb in HD format with duration 97 Min and has been launched in 2014-12-19 with MPAA rating is 142.<br /><br />Original Title : Night at the Museum: Secret of the TombMovie title in your country : Night at the Museum: Secret of the TombYear of movie : 2014Genres of movie : Adventure, Comedy, Fantasy, Family, Status of movie : ReleasedRelease date of movie : 2014-12-19Companies
[…](x, why?) Mini: Septagonhttp://www.mathblogging.org/post/1128622015-03-02T01:00:00-05:00(x, why?)(Click on the comic if you can't see the full image.)<br /> (C)Copyright 2015, C. Burke.I think the only reason Septagon, as in September, isn't used is because then we'd have to use Sexagon for six-sided. This leads to misunderstandings with Sexy Primes, of course. <br>Sadly, there are no Septy Primes <BR><br><br><br></br>
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On the Equivalence between Quadrature Rules and Random Featureshttp://www.mathblogging.org/post/1128632015-03-02T01:00:00-05:00Igor<br />On the Equivalence between Quadrature Rules and Random Features by Francis Bach We show that kernel-based quadrature rules for computing integrals are a special case of random feature expansions for positive definite kernels for a particular decomposition that always exists for such kernels. We provide a theoretical analysis of the number of required samples for a given approximation error, leading to both upper and lower bounds that are based solely on the eigenvalues of the associated
[…]Michael Harris on Elster on Montaigne on Diagoras on Abraham Waldhttp://www.mathblogging.org/post/1128612015-03-01T23:57:28-05:00JSEMichael Harris — who is now blogging! — points out that Montaigne very crisply got to the point I make in How Not To Be Wrong about survivorship bias, Abraham Wald, and the missing bullet holes: Here, for example, is how Montaigne explains the errors in reasoning that lead people to believe in the accuracy of divinations: […]Hey Guys! I’m just throwing this out there……if...http://www.mathblogging.org/post/1128602015-03-01T23:03:39-05:00Unknown<br/> <br/><br/> <br/><br/> <br/>Hey Guys! I’m just throwing this out there…<br/>…if you’ve enjoyed my blog during the many years I’ve been doing this, I’d love if you would consider donating and/or sharing…My dad is shaving his head to raise money to cure childhood cancers. This will be the second year he’s done this and last year he raised +$1100. He’s hoping to beat that this year, but he also signed up kind of late so he’s a little behind.My dad is the reason I am the person I am. He’s an engineer and
[…]Graphemeshttp://www.mathblogging.org/post/1128592015-03-01T22:16:39-05:00JohnHere’s something amusing I ran across in the glossary of Programming Perl: grapheme A graphene is an allotrope of carbon arranged in a hexagonal crystal lattice one atom thick. Grapheme, or more fully, a grapheme cluster string is a single user-visible character, which in turn may be several characters (codepoints) long. For example … a “ȫ” […]Large Quantity of Magnesium Nodules on the Atlantic’s Seafloorhttp://www.mathblogging.org/post/1128562015-03-01T22:06:51-05:00mathscinotesI had a deja vu moment this week. Yahoo had an article on how a large amount of manganese nodules have been found on the Atlantic Ocean's seafloor (Figure 1). Back in the 1960s, I remember reading about Howard Hughes building the Glomar Explorer to mine manganese nodules from the bottom of the ocean. It turned out this story was a CIA cover story for Project Azorian, but that is another story. Continue reading →Solution to Divide Into 4 Equal Partshttp://www.mathblogging.org/post/1128572015-03-01T22:00:50-05:00Presh TalwalkarLast week I asked you to divide a trapezoid into 4 equal parts with 4 equal pieces. There’s a neat trick on how you can do this: you can tile the same shape to re-create the original! (Click to see image of solution) It’s a pretty neat trick that can sometimes work in other dissection […]Monday Puzzle: The 15 Puzzlehttp://www.mathblogging.org/post/1128582015-03-01T22:00:22-05:00Presh TalwalkarSliding block puzzles were a part of my childhood. The puzzle involved moving blocks using the “free space” until you assembled the pieces to re-create a picture. This toy seems pretty boring today, but at one point there was a huge craze about them. In the 1880s, the 15 puzzle was as big as more […]maxwellsequations:#tbt I decided last night that this is...http://www.mathblogging.org/post/1128552015-03-01T21:53:00-05:00Unknown<br/><br/>maxwellsequations:#tbt I decided last night that this is probably my all-time favorite page of notes of mine because while I’m p sure I got some things wrong, I was on the right track. And, I dunno, it’s got some kind of page of notes “it” factor to me.<br/>Early 2013, I was in Honors Calc III, diffy q, Intro Astro II, and I think some gen eds or something. Ha, first A(+/-) in a math class in my entire life was in Honors Calc III with Brodskiy, who rules fwiw. I loved that class so gd much.<br/>Consonance and Dissonance in Musichttp://www.mathblogging.org/post/1128542015-03-01T21:12:00-05:00Phil Keenan Recently I've had a lot of fun composing music using Just Intonation. As a step toward explaining my compositional approach, today I'd like to discuss a theory of why certain combinations of notes sound consonant and others dissonant. This is a controversial subject, since it depends partly on the biology of the ear and brain, and partly on culture. In fact, the list of intervals that are considered consonant or dissonant has sometimes changed over the centuries according to
[…]Responsive design for data visualizationhttp://www.mathblogging.org/post/1128532015-03-01T20:30:12-05:00SergiyMuch of the analytic insight that we consume every day goes through the minds and hands of data scientists. Data scientists own data analysis, this is our profession. Sometimes, we need to create interactive visualizations to communicate our work.
Our audience is increasingly diverse: analytics product owners, researchers, journalists, general public are just a few examples. How do we make sure our visualizations are maximally understandable and usable by our target audience?Give until it hurtshttp://www.mathblogging.org/post/1128522015-03-01T19:55:12-05:00TravisQueen B: Alright girls. Sort your clothes into piles by color so that we can wash them. Ladybug, any clothes you have that are too small for you, you give to the Butterfly. Ladybug: Okay. Queen B: Butterfly, any clothes … Continue reading →On This Day in Math - March 2http://www.mathblogging.org/post/1128512015-03-01T19:00:00-05:00Pat Ballew<br />Conway gate at CMS, Cambridge UK<br /><br />Mathematics education is much more complicated than you expected, even though you expected it to be more complicated than you expected.<br />~Edward Griffith Begle<br /><br />The 61st day of the year; The 61st Fibonacci number (2,504,730,781,961) is the smallest Fibonacci number which contains all the digits from 0 to 9 *Tanya Khovanova, Number Gossip (are there others that contain only the first 2, 3 .. 9 digits? ie 21 has 1,2 but 121393 has 1,2,3 but also a 9. Is there any that
[…][DMANET] Postdoctoral fellowship in Sydneyhttp://www.mathblogging.org/post/1128952015-03-01T18:51:00-05:00Lance FortnowPostdoctoral fellowship in Sydney:We are advertising a 24-month postdoctoral research fellowship in<br>theoretical computer science shared between University of Sydney and<br>University of New South Wales, Australia. The expected start date is<br>September 2015.The successful applicant will conduct research on algorithms with<br>Serge Gaspers, Joachim Gudmundsson and Julian Mestre in the USYD SACT<br>research group and UNSW Algorithms group. The aim will be to design<br>algorithms in the areas of approximation</br>
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