Mathblogging.orgRecent Postshttp://www.mathblogging.org/scripts/feed.php2015-03-03T03:49:25-05:00No copyright asserted over individual posts; see original posts for copyright and/or licensing.Mathblogging.org Atom serializerKicking Some Serious Triangle Bootyhttp://www.mathblogging.org/post/1129542015-03-02T19:49:00-05:00Kate NowakThe children understand that sin, cos, and tan are side ratios. The children! They understand! They are not making ridiculous mistakes, and they can answer deeper understanding questions like, "Explain why sin(11) = cos(79)." I think right triangle trig is a frequent victim of the "First ya do this, then ya do this" treatment -- where kids can solve problems but have no idea what is going on. There's often not a ton of time for it, and it responds well to memorized procedures (in the short […]On This Day in Math - March 3http://www.mathblogging.org/post/1129532015-03-02T19:00:00-05:00Pat Ballew*CHM<br />A set is a Many that allows itself to be thought of as a One.~Georg Cantor<br /><br />The 62 day of the year; 62 is the smallest number that can be written as the sum of 3 distinct squares in 2 ways. (Students might try to find the smallest number that can be written as the sum of 2 distinct squares in 2 ways)<br /><br />In base 10, 62 is also the only number whose cube (238328) consists of 3 digits each occurring 2 times<br /><br />The digits 62 occur at the 61st & 62nd digits of phi, φ; AND The 61st & 62nd digits […]Comparing and Ordering Decimalshttp://www.mathblogging.org/post/1129522015-03-02T18:47:36-05:00mathmindsblogIt is always so interesting to me what students take away in terms of strategies for doing various tasks in math class. In this particular case, ordering and comparing decimals. We all did the same shading activities, played the same comparing games, however the way this shading is applied to student thinking is so different […]Googling with Googolhttp://www.mathblogging.org/post/1129512015-03-02T18:45:00-05:00mathfailClose enough… Thanks tofor this submission!An interesting Robert Kaplinsky post shared by Tracy Johnston Zagerhttp://www.mathblogging.org/post/1129492015-03-02T18:23:58-05:00mjlawlerSaw this interesting tweet from Tracy Johnston Zager tonight: After going through the post I scrapped what I’d planned to do with the boys tonight and asked each of them to go through Kaplinsky’s three questions. I’m doing a geometry course with my older son this year, so I expected that these questions would be…Is Jeffreys’ prior unique?http://www.mathblogging.org/post/1129482015-03-02T18:15:34-05:00xi'an“A striking characterisation showing the central importance of Fisher’s information in a differential framework is due to Cencov (1972), who shows that it is the only invariant Riemannian metric under symmetry conditions.” N. Polson, PhD Thesis, University of Nottingham, 1988 Following a discussion on Cross Validated, I wonder whether or not the affirmation that Jeffreys’ […]Space Diagonalhttp://www.mathblogging.org/post/1129502015-03-02T18:11:00-05:00Regan GalvanAfter 8 years teaching Geometry from this textbook, I finally made the lesson on Space Diagonals more interesting than saying: Do Pythag twice. Sure always do the Space Diagonal Dance, to much laughter, but the PrBL model wins. No, I don't have a video of the dance (that I know of).<br /><br />I happened to have brought donuts for a meeting so I had this box.<br /><br />I made up a story told them the legend of the Prince who made his butler leave the castle on a quest to find a delicious bread stick, the crunchy […]Who has? I have!http://www.mathblogging.org/post/1129472015-03-02T17:51:00-05:00Regan GalvanHave I ever mentioned that I used to also teach history? It has been since 2008, and I have always also taught math, but in my former life as high school history teacher, my classes played a variety of games aimed at learning vocabulary. They don't always translate well to math, but this one does, so long as the problems are short and can be done without paper.<br /><br /><br />Step 1: Make a card set with the same number of cards as students (in classes with varying numbers of kids, some kids will hold two […]Introducing shinyStanhttp://www.mathblogging.org/post/1129452015-03-02T17:30:24-05:00Jonah Sol Gabry        As a project for Andrew’s Statistical Communication and Graphics graduate course at Columbia, a few of us (Michael Andreae, Yuanjun Gao, Dongying Song, and I) had the goal of giving RStan’s print and plot functions a makeover. We ended up getting a bit carried away and instead we designed a graphical user interface […]
The post Introducing shinyStan appeared first on Statistical Modeling, Causal Inference, and Social Science.GeoGebra Global Gatheringhttp://www.mathblogging.org/post/1129462015-03-02T17:15:16-05:00Markus HohenwarterWe are happy to inform you that the official registration and abstract submission for the GeoGebra Global Gathering Conference are now open. Join us at our GeoGebra Global Gathering (G3, 2015) July 15 – 17 in Linz in Austria and register…Read more ›
Five MIT researchers win Sloan Research Fellowshipshttp://www.mathblogging.org/post/1129442015-03-02T17:15:00-05:00News OfficeFaculty specializing in mathematics, chemistry, mechanical engineering, and economics among 126 selected.A mathematician’s year in Japanhttp://www.mathblogging.org/post/1129432015-03-02T17:12:19-05:00Joel David Hamkins[bibtex key=Hamkins2015:AMathematiciansYearInJapan] Continue reading →A Big Year for Dwarf Planetshttp://www.mathblogging.org/post/1129422015-03-02T16:25:31-05:00Jeffrey Bryant2015 is shaping up to be an interesting year in space exploration. For the first time, we will get up-close views of a dwarf planet. In fact, two different spacecraft will visit two different dwarf planets. The Dawn spacecraft is nearing its second primary target, Ceres, later this week. Later this year, the New Horizons [...]Análisis ABC de Ventas de Productos mediante un Diagrama de Paretohttp://www.mathblogging.org/post/1129402015-03-02T16:12:49-05:00GEO Tutoriales
Uno de los aspectos claves en la competitividad de una Cadena de Suministro es tomar decisiones acertadas en cuanto a los tamaños de pedidos a realizar a los proveedores, teniendo en consideración un entorno con una demanda incierta y productos con distinto ciclo de vida. En este contexto las metodologías cuantitativas constituyen una contribución en este desafío […]Leonard Nimoy (1931-2015)http://www.mathblogging.org/post/1129412015-03-02T15:46:30-05:00Unknown
<br />
Bill and I rarely write joint blog posts but with the loss of a great cultural icon we both had to have our say.<br />
<br />
Bill: Leonard Nimoy (Spock) died last week at the age of 83. DeForest Kelley (McCoy) passed away in 1999. William Shatner (Kirk) is still alive, though I note that he is four days older than Nimoy.<br />
<br />
Spock tried to always be logical. I wonder if an unemotional scientist would be a better or worse scientist.<br />
Does emotion drive our desire to learn things? Our choice of problems to […]When discipline crosses the linehttp://www.mathblogging.org/post/1129382015-03-02T15:11:00-05:00MarkI've been meaning to write this up for a while now, but recent news about attrition (see here and here for the conversation up to now) has brought the issue back to the forefront.<br /><br />When you take a close at the increasingly dominant charter model (the "no-excuses" school) and some of the highly touted success stories (such as the KIPP schools), you will soon notice how extreme some of the discipline can be.<br />A tiny padded room at KIPP Star Washington Heights Elementary School was a
[…]Q: Why does kinetic energy increase as velocity squared?http://www.mathblogging.org/post/1129392015-03-02T15:07:39-05:00The PhysicistThe original question was: … the formula for kinetic energy is and the formula for momentum is . I ran into these in physics class long ago and was really bothered by the first formula. How can energy go up … Continue reading →Rembrandt van Rijn (2) vs. Betrand Russellhttp://www.mathblogging.org/post/1129332015-03-02T15:00:22-05:00AndrewFor yesterday, the most perceptive comment came from Slugger: Rabbit Angstrom is a perfect example of the life that the Buddha warns against. He is a creature of animal passions who never gains any enlightenment. In any case, I think we can all agree that Buddha is a far more interesting person than Updike. But, […]
The post Rembrandt van Rijn (2) vs. Betrand Russell appeared first on Statistical Modeling, Causal Inference, and Social Science.convergence of infinite series with non negative terms proofhttp://www.mathblogging.org/post/1129342015-03-02T14:53:51-05:00Unknownnewest proofconvergence of infinite series with non negative termshttp://www.mathblogging.org/post/1129352015-03-02T14:40:58-05:00Unknownnewest propositionEat Pihttp://www.mathblogging.org/post/1129282015-03-02T14:32:01-05:00Unknown[...]Madden ratings formulahttp://www.mathblogging.org/post/1129272015-03-02T14:30:07-05:00Nathan YauIn football video game Madden, NFL players are scored based on skill, which determines how they play in the game. Neil Paine, with graphics by Reuben Fischer-Baum, describes more than…Tags: gaming, Madden, sportsCreativity and Challenge in the Classroomhttp://www.mathblogging.org/post/1129372015-03-02T14:24:05-05:00ideasfortheclassroomOn Saturday I was lucky enough to be invited to a course that Ed Southall was running for his ITE students at Huddersfield Uni. This was being led by Don Steward. If you’re sat there reading this and saying “who?” you need to go and look at his excellent MEDIAN website which is full to the […]Montessori vs. Dorfschulehttp://www.mathblogging.org/post/1129292015-03-02T14:20:00-05:00Jan-Martin KlingeIch möchte heute gerne etwas über die unterschiedlichen Schulen erzählen, die meine Tochter so besucht hat. Meine Sichtweise ist dabei total subjektiv und ist bei anderen Eltern, anderen Kindern, anderen Schulen mit Sicherheit ganz anders. Aber ich bin einige Male nach meiner Einschätzung gefragt worden – und was ist das … Continue reading → Zombie simulator lets you plan your own apocalypsehttp://www.mathblogging.org/post/1129362015-03-02T14:15:00-05:00UnknownThe first model of a zombie epidemic to use real US census data lets you choose where the plague begins and how fast it spreads<br clear='all'/><br/><br/><br/><br/><br/><br/>monotone convergencehttp://www.mathblogging.org/post/1129302015-03-02T14:02:26-05:00Unknownupdated theoremReflecting on Alamar's reflection on sports datahttp://www.mathblogging.org/post/1129322015-03-02T14:00:00-05:00junkchartsBen Alamar reflects on the rise of data analytics in the NBA (link). I like this passage very much, which really nails home the point that good analytics requires intuition: The hours of waiting [during draft meetings] were often filled with watching film of prospects. It helped me refine my analysis, as I soaked up details from scouts that I never would have seen on my own. ("Rewind that. ... Did you see his foot placement there, getting ready for the rebound? That's NBA ready.") […]every bounded monotonic sequence is convergent proofhttp://www.mathblogging.org/post/1129312015-03-02T13:52:09-05:00Unknownnewest proofBird in the Cagehttp://www.mathblogging.org/post/1129262015-03-02T13:43:00-05:00Vlad AlexeevBird in the Cage
by Vlad Alexeev
http://im-possible.info/english/art/vlad-alexeev/bird-in-the-cage.html
Playful Math Snacks for March 2015http://www.mathblogging.org/post/1129242015-03-02T13:33:11-05:00Denise GaskinsTeachers and other math nerds are preparing to celebrate an epic Pi Day on 3/14/15. Unfortunately, the activities I see on teacher blogs and Pinterest don’t include much actual math. They stress the pi/pie wordplay or memorizing the digits. With … Continue reading →