Mathblogging.orgRecent Postshttp://www.mathblogging.org/scripts/feed.php2015-06-30T15:39:59-04:00No copyright asserted over individual posts; see original posts for copyright and/or licensing.Mathblogging.org Atom serializer2015 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...[DMANET] PhD Position: Maintenance Optimization for Rail Infrastructure Systemshttp://www.mathblogging.org/post/1231212015-06-30T01:39:00-04:00Lance FortnowThe School of Mathematical and Physical Sciences at the University of<br>Newcastle is offering an Australian Postgraduate Award (Industry)<br>scholarship worth AU$25,849 per annum. The scholarship will be funded<br>under an Australia Research Council (ARC) Linkage Grant, and is<br>collaborative with Martin Savelsbergh and Natashia Boland from Georgia<br>Institute of Technology's ISyE School, and with Aurizon, Australia's<br>largest rail freight operator.Coal and iron ore export supply chains critically depend
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[…]Il problema di giugno (562) - Un caso di probabilità casualehttp://www.mathblogging.org/post/1231502015-06-30T01:00:37-04:00Rudy d’Alembert, Alice Riddle e Piotr Rezierovic SilverbrahmsOrbene, è inutile girarci troppo attorno: il problema del mese verteva su uno dei soliti tormentoni dei nostri tre intrepidi eroi. Anzi, il tormentone dei tormentoni, quello che si regge tutto sull'intolleranza di Alice verso la Teoria delle Probabilità e l’insano fascino che quest’ultima continua ad esercitare nei confronti di Rudy.
Ci si potrebbe interrogare su [...]The power set http://www.mathblogging.org/post/1230962015-06-30T01:00:10-04:00Unknown<br/><br/>
The power set 2.12http://www.mathblogging.org/post/1230942015-06-30T01:00:00-04:00Arseniy Akopyan-
Figures sans paroles
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Les figures sans parolesCodes for kids: Simple substitution ciphershttp://www.mathblogging.org/post/1230842015-06-30T00:37:30-04:00Gary Ernest DavisThe idea of a simple substitution code Simple substitution ciphers substitute one letter of the alphabet for another, in some random arrangement. Here is an example of a simple substitution cipher: A → D B → V C → N D → X E → I F → K G → S H → W […]Really? I always thought he was more of a square….http://www.mathblogging.org/post/1230812015-06-30T00:10:59-04:00Unknown<br/><br/>Really? I always thought he was more of a square….Slides and Implementation: Random forests with random projections of the output space for high dimensional multi-label classificationhttp://www.mathblogging.org/post/1230822015-06-30T00:00:00-04:00Igor We mentioned this before a year ago, here are the slides: Random forests with random projections of the output space for high dimensional multi-label classification by Arnaud Joly, Pierre Geurts, Louis Wehenkel. <br />The implementation of the random output tree is here at: https://github.com/arjoly/random-output-trees<br /> Join the CompressiveSensing subreddit or the Google+ Community or the Facebook page and post there !<br /> Liked this entry ? subscribe to Nuit Blanche's feed, there's more
[…]Summer camp lets students explore the ‘power and beauty’ of mathhttp://www.mathblogging.org/post/1231522015-06-30T00:00:00-04:00UnknownThe University of Ottawa recently hosted a mathematics camp from June 25 to 30 in partnership with the Canadian Mathematical Society. Almost 50 grade ten students in Ontario and Québec who were interested in mathematics attended the residential camp. "The camp is an opportunity to give the students a flavour of the power and beauty of mathematics,” said camp co-organizer and University of Ottawa mathematics professor Joseph Khoury. The bilingual camp gives participants an opportunity to […]Adobe Acrobat Pro DC (2015) 多国语言特别版破解版免费下载（持续更新）http://www.mathblogging.org/post/1230802015-06-29T23:52:37-04:00lttt(小小泪)http://www.luoxiao123.cn/1136.htmlHey, this is what Michael Lacour should’ve done when they asked him for his datahttp://www.mathblogging.org/post/1230832015-06-29T23:42:32-04:00AndrewTexas Town Is Charging Us $79,000 for Emails About Pool Party Abuse Cop. FOIA that, pal!
The post Hey, this is what Michael Lacour should’ve done when they asked him for his data appeared first on Statistical Modeling, Causal Inference, and Social Science.Photohttp://www.mathblogging.org/post/1230792015-06-29T23:41:05-04:00Unknown<br/><br/>