Mathblogging.orgRecent Postshttp://www.mathblogging.org/scripts/feed.php2015-06-30T17:23:34-04:00No copyright asserted over individual posts; see original posts for copyright and/or licensing.Mathblogging.org Atom serializerVowpal Wabbit: A Machine Learning System ( Paris Machine Learning Meetup "Hors Série" #4 Season 2 )http://www.mathblogging.org/post/1231242015-06-30T09:51:00-04:00Igor<br />Following up on meetup #6 Season 2, John Langford just gave us a tutorial presentation on Vowpal Wabbit this morning in Paris (Thank you Christophe and AXA for hosting us). Here are the slides: Vowpal Wabbit: A Machine Learning System Here is some additional relevant background material.<br />The wiki: https://github.com/JohnLangford/vowpal_wabbit/wiki The mailing list: https://groups.yahoo.com/neo/groups/vowpal_wabbit/infoLearning to search framework: http://arxiv.org/abs/1406.1837Learning
[…]“Looking Back ” by Extending Problemshttp://www.mathblogging.org/post/1231232015-06-30T09:49:13-04:00jd2718I like posing and solving problems on-line. Is this reflected in my classroom? Not enough, but yes. In the fall term of algebra classes I carve out a day here or there, or maybe a few half-periods, to work on extended problem solving. It is generally not on-topic. On-topic would allow the kids to know […]The Power of Partnerships: From the Classroom to the Boardroomhttp://www.mathblogging.org/post/1231172015-06-30T09:48:57-04:00ChristinaFor today’s students, forging a path from the classroom to the boardroom requires much more than tireless focus and persistent passion. More than ever before, students need opportunities to learn real-world, hands-on skills from actual STEM professionals—whether in afterschool programs or true work-based learning opportunities. Increasingly, it is these kinds of opportunities that help young people develop the important skills they need to climb the corporate ladder—like problem solving,
[…]Counting and a fun harmonic series facthttp://www.mathblogging.org/post/1231482015-06-30T09:45:00-04:00mjlawlerSaw this tweet (and embeded comic) from Evelyn Lamb last week: I remembered the comic this morning the boys and I were talking about section 2.3 of Art of Problem Solving’s Introduction to Counting and Probablilty – complimentary counting. Though the divergence of the harmonic series wasn’t something that they were likely to remember, showing…Where does Mister P draw the line?http://www.mathblogging.org/post/1231252015-06-30T09:44:52-04:00AndrewBill Harris writes: Mr. P is pretty impressive, but I’m not sure how far to push him in particular and MLM [multilevel modeling] in general. Mr. P and MLM certainly seem to do well with problems such as eight schools, radon, or the Xbox survey. In those cases, one can make reasonable claims that the […]
The post Where does Mister P draw the line? appeared first on Statistical Modeling, Causal Inference, and Social Science.STEMtistic on Display: Novice Science Teachershttp://www.mathblogging.org/post/1231182015-06-30T09:42:07-04:00nadelNovice teachers often lack the resources and professional development to catapult their teaching strategies -- particularly in high-poverty schools. We know that educators, specifically STEM teachers, need our support. Investing in quality STEMworks programs focused on teacher professional development is a great place to start.Tags:  science, teachersClassifying Math Mistakeshttp://www.mathblogging.org/post/1231132015-06-30T09:35:07-04:00mpershanEvery few years I try this. It’s gotten to the point where I can no longer tell if this is actually helpful or illuminating, but below you’ll see the categories that I created when I tried to sort a bunch of mistakes that I’d logged on this site. Enjoy, and please share any disagreements or alternate… Continue reading →JBC cancer paper felled by duplication is one author’s second retraction this monthhttp://www.mathblogging.org/post/1231112015-06-30T09:30:29-04:00Shannon PalusA 2002 paper in the Journal of Biological Chemistry on how lung cancer cells resist death has been retracted for duplicating figures from a 2001 paper. The retracted paper, “Fibroblast growth factor-2 induces translational regulation of Bcl-XL and Bcl-2 via a MEK-dependent pathway: correlation with resistance to etoposide-induced apoptosis,” shares the first and last authors […]
The post JBC cancer paper felled by duplication is one author’s second retraction this month
[…]Prime Numbers: From Euclid to AKShttp://www.mathblogging.org/post/1231262015-06-30T09:23:12-04:00Manjil SaikiaMathematicians have tried in vain to this day to discover some order in the sequence of prime numbers, and we have reason to believe that it is a mystery into which the mind will never penetrate. - Leonhard Euler Prime numbers have taken the fancy and imagination of almost every mathematician in the world atCracked, on the other hand, is very good at talking about mathhttp://www.mathblogging.org/post/1231152015-06-30T09:00:00-04:00MarkI tend to avoid Cracked.com. Their articles are thoughtful, informative and enormously entertaining. They can discuss complex, even technical subjects in a clear and engaging way. All of this makes the site a dangerous time sink and I just can't afford to hang ouot there.<br /><br />From 6 Small Math Errors That Caused Huge Disasters<br />#4. A Huge Walkway Collapses Due to a (Seemingly) Inconsequential Design Change<br /><br />When designing their newest hotel to be built in downtown Kansas City, the fine people at
[…]The Water Tower Problem and the Perils of Roundinghttp://www.mathblogging.org/post/1231122015-06-30T08:45:00-04:00(x, why?)Question 34, the first Part IV question of the New York State Geometry (Common Core) Regents exam for June 2015, read as follows: The water tower in the picture below is modeled by the two-dimensional figure beside it. The water tower is composed of a hemisphere, a cylinder, and a cone. Let C be the center of the hemisphere and let D be the center of the base of the cone. <BR> <BR>If AC = 8.5 feet, BF = 25 feet, and m∠EFD = 47°, determine and state, to the nearest cubic foot, the volume of the
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[…]2015 1st Half in Review – Mathematicshttp://www.mathblogging.org/post/1231162015-06-30T08:35:38-04:00Guillermo BautistaTime flies indeed! Half of the year is over. If you have observed, I have refrained from posting reviews every month. This is due to the fact that I am only posting 4-5 posts every month. The first half of the year have been so busy and I think the next half will even be busier. Anyway, […]
Math and Multimedia - School math, multimedia, and technology tutorials.
6/30/15http://www.mathblogging.org/post/1231102015-06-30T08:30:23-04:00Unknown6 = 30 * 1 / 5Also:6 / (3 + 0) = √(|1 - 5|)Tangential Chaoshttp://www.mathblogging.org/post/1231512015-06-30T08:16:28-04:00Unknownf(x)=(4x-4x^3)/(x^4-6x^2+1). Solve the system y=f(x), z=f(y), x=f(z). Iterations on function f are chaoticNew Buzzmath Activity – Identify Functions of a Graphhttp://www.mathblogging.org/post/1231092015-06-30T08:00:00-04:00alisonFor every tick there’s a tock, for every ying there’s a yang and for every input there is an output. Well, this is true if you are a function. What exactly is a function? What does a function look like? Identify Functions of a Graph will not only answer these questions for students, but will […]50 Years of the Biennial Conference on Numerical Analysishttp://www.mathblogging.org/post/1231142015-06-30T07:19:00-04:00Nick HighamLast week (June 23-26, 2015) around 200 numerical analysts congregated in Glasgow for the 26th Biennial Conference on Numerical Analysis, held at the University of Strathclyde. This was the 50th anniversary of this biennial conference, the first of which was … Continue reading →When does an interview become free consulting?http://www.mathblogging.org/post/1231082015-06-30T07:07:25-04:00Cathy O'Neil, mathbabeI recently had a weird and negative experience applying for a job. I went for standard the day-long interview, and answered a bunch of questions, and met a bunch of people, maybe 9. In one of the interviews, they asked me how I would approach some of the data questions they were working on, and […]Next Steps from a Trianglehttp://www.mathblogging.org/post/1231062015-06-30T06:45:28-04:00chrisharrowWatching the news a couple mornings ago, an impossible triangle appeared on the screen. Hopefully some readers might be able to turn some first ideas a colleague and I had into a great applied geometry lesson. What follows are some teacher … Continue reading →NBER IFM Data Session and Sitehttp://www.mathblogging.org/post/1231072015-06-30T06:37:00-04:00Francis DieboldThe NBER's International Finance and Macroeconomics (IFM) Program is sponsoring a 2015 Summer Institute "Data Session" and a corresponding web site ("Catalog of Data Sources") where the various datasets are archived.<br /><br />Great idea. Hats off to the organizers, Galina Hale and Michael Klein. <br /><br />This summer's IFM data session is not the first, but the initiative is still very young. Of course there may be incompletely-resolved issues regarding how best to organize the data sessions and site,
[…]Paper: Fair apportionment in the view of the Venice Commission’s recommendationhttp://www.mathblogging.org/post/1231052015-06-30T06:21:00-04:00László KóczyIn most, though not all elections one can vote for candidates in electoral districts. Designing the districts is obviously a sensitive issue. How to do it well? Mathematical Social Sciences has just published our paper (joint with Péter Biró and Balázs Sziklai) on the Leximin apportionment method. The paper is free to download until 19 August 2015. <br />When it comes to districting there are at least two issues. Gerrymandering refers to the arbitrary layout of districts to the
[…]Hausdorff dimension of the graphs of the classical Weierstrass functions (after Weixiao Shen)http://www.mathblogging.org/post/1231042015-06-30T05:43:59-04:00matheuscmssAbout two weeks ago, Weixiao Shen gave the talk “Hausdorff dimension of the graphs of the classical Weierstrass functions” during the Third Palis-Balzan International Symposium on Dynamical Systems. In the sequel, I will transcript my notes from Shen’s talk. 1. Introduction In Real Analysis, the classical Weierstrass function is with . Note that the Weierstrass […][DMANET] PhD position in Operational Research applied to logistics, Le Havre, Francehttp://www.mathblogging.org/post/1231192015-06-30T05:28:00-04:00Lance FortnowNOTE : second call for PhD candidates, be careful to the short delay.<br>The LITIS laboratory of le Havre university offers a financed PhD <br>position in logistics starting in october 2015. The candidate should <br>possess (or terminate) a master in computer sciences, with skills in OR <br>and/or AI.See below the description of the subject.Application files should be sent by e-mail to the three supervisors, <br>Stefan Balev, Antoine Dutot, an Eric Sanlaville (see email addresses in <br>this mail header). They</br>
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[…]Animated map shows Trans-Atlantic slave tradehttp://www.mathblogging.org/post/1231032015-06-30T04:54:50-04:00Nathan YauThe Trans-Atlantic Slave Trade Database provides records for thousands of voyages between the 16th and 19th centuries. Andrew Kahn for Slate mapped about 20,000 of them. Portugal and Spain are…Tags: animation, Slate, slavery[DMANET] CFP: Elsevier Ad Hoc Networks Journal [IF=1.94] -- SI on "Smart Wireless Access Networks and Systems For Smart Cities"http://www.mathblogging.org/post/1231202015-06-30T04:47:00-04:00Lance Fortnow**********************************************************<br>*<br>* Contributions to be spread via DMANET are submitted to<br>*<br>* DMANET@zpr.uni-koeln.de<br>*<br>* Replies to a message carried on DMANET should NOT be<br>* addressed to DMANET but to the original sender. The<br>* original sender, however, is invited to prepare an<br>* update of the replies received and to communicate it<br>* via DMANET.<br>*<br>* DISCRETE MATHEMATICS AND ALGORITHMS NETWORK (DMANET)<br>*
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[…]Leap Secondhttp://www.mathblogging.org/post/1231022015-06-30T04:30:00-04:00David6/30/2015<br /><br />Just in case you did not get your memo from NASA:<br /><br />Before you go to bed tonight, move your clocks ahead by 1 second. NASA is adding a leap second tonight.<br /><br />The last leap second that was added occurred in 2012. So they don't happen often. But with a few exceptions, I don't think most people will notice the change. Still it will be refreshing to know that we will all get an extra second of sleep tonight.<br /><br />Source:
[…]True or Falsehttp://www.mathblogging.org/post/1231012015-06-30T03:30:00-04:00David6/30/2015<br /><br />63,015 is a 602-gonal, 6,303-gonal, and a 21,006-gonal number. It is a composite, deficient, Harshad, odd, Smith, sphenic, square-free, and unprimable number.<br /><br />Have you ever heard the rule that "There is an exception to every rule."?<br /><br />Is that rule true or false?<br /><br />If a rule had an exception then that rule would be false. Take the spelling rule "i before e, except after c". I think it is a weird rule. In the word "weird" the i does not come before the e, and there is no […]Functionshttp://www.mathblogging.org/post/1231002015-06-30T03:09:14-04:00Colleen YoungDesmos can be used very simply to illustrate function notation and note the use of Desmos as a calculator to evaluate the value of a function for a given input. (Select image to go to the Desmos graph page). The … Continue reading →Educación para y desde la comunidad planetariahttp://www.mathblogging.org/post/1230982015-06-30T02:41:40-04:00SangakooImagen extraída del blog Santiago08’s Weblog.webloc Parece poco razonable una reflexión sobre la educación “para y desde” la comunidad planetaria (nuestra especie). Pero eludimos un racionamiento que puede ser obsoleto dado que la educación como cultura exige, hoy día, una forma transcultural que permita aunar lo local en lo universal y entender lo universal en lo […]IntMath Newsletter: Pedigrees, resourceshttp://www.mathblogging.org/post/1230992015-06-30T02:32:37-04:00Murray1. Pedigree collapse <br />
2. Resource: eMathHelp <br />
3. Resonant frequency example <br />
4. Math puzzles<br />
5. Math movie: How equal do we want the world to be?<br />
6. Final thought: What employers care about
The post IntMath Newsletter: Pedigrees, resources appeared first on squareCircleZ.
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[…]Wiskunde en konijnenhttp://www.mathblogging.org/post/1230972015-06-30T01:55:00-04:00Willem van Ravenstein<br /><br />Zondag 28 juni 2015 was de uiterlijke datum om opdrachten in te leveren en de PO af te ronden. Dat kan je in de grafiek wel terugvinden, denk ik...:-)<br /><br />Op 29 juni 2015 konden de leerlingen in de bezemklas de PO nog afmaken. <br /><br />Op 30 juni 20 ben ik er mee gestopt. Volgend jaar misschien wel weer...!? Ik ga dan wel aan de inhoud sleutelen. We zien wel...