Mathblogging.orgRecent Postshttp://www.mathblogging.org/scripts/feed.php2014-10-23T11:06:12-04:00No copyright asserted over individual posts; see original posts for copyright and/or licensing.Mathblogging.org Atom serializerCounting coauthors, 2http://www.mathblogging.org/post/1021652014-10-23T03:54:56-04:00Peter CameronI have decided to move one step towards practising what I preach. The arXiv is now the de facto place of publication of many mathematics papers; Google Scholar recognises it, as do various other sites such as ResearchGate. So shouldn’t … Continue reading →Urlettohttp://www.mathblogging.org/post/1021642014-10-23T03:31:00-04:00Marco Fulvio Barozzi<br />Ho visto i blogger scientifici migliori della mia generazione distrutti dal disincanto, affamati nudi isterici, trascinarsi dall'alba al tramonto per i social network in cerca di una siringata rabbiosa di droga, un cazzeggio consolatorio, un mi piace regalato da uno sconosciuto da cui magari li separa un abisso di sensi; hipster laureati bramare l'antico contatto paradisiaco con la dinamo stellatanel macchinario della notte lontana dei loro
[…]Mile of Pi - Numberphile
This video by Numberphile is...http://www.mathblogging.org/post/1021612014-10-23T03:05:00-04:00Unknown<br/><br/>Mile of Pi - Numberphile
This video by Numberphile is uncharacteristically light on math but is still pretty cool to watch - they printed out a million digits of pi (which ended up being just over a mile of pi) and unravelled it on the landing strip of an airport in Denmark! What is the mitoflash probe sensing?http://www.mathblogging.org/post/1021632014-10-23T03:02:00-04:00Systems and Signals Group<br />As we've written about before, mitochondria generate the energy required by our cells through respiration that involves using an "electrochemical gradient" as an energy store (a bit like pumping water up into a reservoir for energy storage to then harness it flowing down the gradient of a hill to turn a turbine), and produces free oxygen radicals as by-products (a bit like sparks when the engine is running hot). The fundamental importance of this machinery which not only delivers energy, but is
[…]1295http://www.mathblogging.org/post/1021622014-10-23T03:00:00-04:00Mathematical Association of America1295 = 5 x 7 x 37.<br /><br />1295 is 5555 in base 6 (A097252).<br /><br />1295 has the representation 64 - 1 (A123865 and A024062). It is a subperfect power (A045542).<br /><br />1295 is the sum of consecutive cubes (A217843).<br /><br />1295 is the difference of two positive fourth powers (A147857).<br /><br />Every run of digits of 1295 in base 4 has length 2 (A033002): 110033.<br /><br /><br />Source: What's Special About This NumberBibTool on the airhttp://www.mathblogging.org/post/1021602014-10-23T02:14:26-04:00xi'anYesterday night, I realised I had about 30 versions of my “mother of all .bib” bib file, spread over directories and with broken links with the original mother file… (I mean, I always create bib files in new directories by a hard link, ln ~/mother.bib but they eventually end up with a life of their […]Special Right Triangles - Really?http://www.mathblogging.org/post/1021572014-10-23T01:01:00-04:00Chuck BakerWhat's in the list you keep (internally or physically) of things we still traditionally teach in our math courses that just feel "wrong" in 2014? Memorizing formulas is probably one of my least favorite things, and I know I have that in common with my students, so wherever and whenever possible! I like to teach them the concept on a pattern level or with strategies that have more than one(x, why?) Mini: Algebra Problemshttp://www.mathblogging.org/post/1021582014-10-23T01:00:00-04:00(x, why?)(Click on the comic if you can't see the full image.)<br /> (C)Copyright 2014, C. Burke.There are Algebra problems and then there are Algebra problems! <BR><br><br><br></br>
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A New Twist on Flexagons?http://www.mathblogging.org/post/1021592014-10-23T00:59:58-04:00KWReganFor Martin Gardner’s 100th birthday Martin Gardner introduced many including myself to the joys of Discrete Mathematics. His glorious monthly column “Mathematical Games” for Scientific American included some continuous mathematics too, of course; one could center it on “Concrete Mathematics.” However, I conjecture—based on a quick flip of the several books I own of his […]Singapore maths is travelling the worldhttp://www.mathblogging.org/post/1021562014-10-23T00:45:09-04:00UnknownSingapore maths is travelling the world: Amelia Tang:
Singapore mathematics is going places, and there are no signs of it slowing down.
From India to France and Chile, more countries have, in recent years, turned to the famed Singapore approach to teaching the subject, using visual means such as objects, pictures and diagrams to teach concepts.
[source: mme rss]Soluciones a los problemas de cálculo (II)http://www.mathblogging.org/post/1021552014-10-23T00:06:01-04:00Miguel LacruzHe preparado un documento en formato pdf con una clave de soluciones a problemas seleccionados del tema 2 de la asignatura Cálculo infinitesimal. Se puede descargar este documento pinchando en este enlace.AB Quizzes in the mathematics classroomhttp://www.mathblogging.org/post/1021542014-10-22T23:36:00-04:00enzuberNotes and resources for a presentation I gave to the North Sydney Region Maths Association this week: <br /><br /><br /><br />PowerPoint template for an AB quiz<br /><br />Author's copy of article in MANSW Reflections - 2013 Conference Issue<br /><br />Thanks for the invite and feedback - some great ideas from the group to experiment further with the AB Quiz concept.Just Playin’http://www.mathblogging.org/post/1021532014-10-22T23:02:49-04:00Cathy YencaWe just wrapped up our first quarter of the year, and I’ve noticed something. We like to play. Every class period has it’s own culture… it’s own “thing”. It’s usually not very math-related, but I’d venture to say this “thing” … Continue reading →Unizor - Probability - Bernoulli Distributionhttp://www.mathblogging.org/post/1021512014-10-22T22:58:00-04:00Zor Shekhtman<br /><br /><br /><br />Let's examine the properties of Bernoulli distribution of probabilities, a distribution of a random variable ξ, defined on a space of only two elementary events that we call SUCCESS (with a probability measure p) and FAILURE (with probability measure q=1−p), and taking, correspondingly, two values<br />ξ(SUCCESS) = 1 and<br />ξ(FAILURE) = 0.<br />So, we can say that our random variable ξ takes a value of 1 with probability p and a value of 0 with probability q=1−p:<br />P(ξ=1) = p and<br />P(ξ=0) = q = […]Seventh Birthday Coming Friday!http://www.mathblogging.org/post/1021522014-10-22T22:45:00-04:00(x, why?)Hard to believe that nearly seven years have passed since I started making these comics to pass the time and to keep my sanity. And then I started to lose a little sanity trying to keep to a schedule. So much so that I even had vacation strips running for a week! But (x, why?), which started on this blog and then migrated -- for better exposure, I guess -- to the Comic Genesis site, is having a 7th birthday, or it is an anniversary, on Friday. I guess it isn't too hard to believe that a
[…]Substitution (…and Continued Fractions)http://www.mathblogging.org/post/1021502014-10-22T22:33:56-04:00samjshahToday in Precalculus I went on a bit of a 7 minute digression, talking about continued fractions. You see, a recursive problem showed up (we’re doing sequences): Write out the first five terms of the following sequence: where So obviously they go like: ,, , , and So great. Awesome. NOT. Booooring. So I showed them […]September 2014: Blog Contentshttp://www.mathblogging.org/post/1021482014-10-22T22:00:28-04:00MayoSeptember 2014: Error Statistics Philosophy Blog Table of Contents Compiled by Jean A. Miller (9/30) Letter from George (Barnard) (9/27) Should a “Fictionfactory” peepshow be barred from a festival on “Truth and Reality”? Diederik Stapel says no (rejected post) (9/23) G.A. Barnard: The Bayesian “catch-all” factor: probability vs likelihood (9/21) Statistical Theater of the Absurd: “Stat on a […]Cup Stackinghttp://www.mathblogging.org/post/1021492014-10-22T21:43:35-04:00dkane47I’m deep in the middle of a unit on linear relationships. I’ve been excited about teaching a lesson using Andrew Stadel’s cup stacking lesson since the beginning of the year. I took the basic three-act lesson and added a bit more structure to it to try and get at some specific issues my students had […]How Not To Quit Teachinghttp://www.mathblogging.org/post/1021432014-10-22T21:34:00-04:00Michael PershanThinking of leaving teaching? Here are some posts to get you started:<br />"Breaking Up with Teaching""Twin Pressures on Good Novice Teachers""Trying Not to Leave the Classroom""The Trap of the 2nd Year""The Ledge""When you get down to it, who knows how long I'll be in this profession."Read them all, and you'll find yourself with many arguments for leaving classroom teaching. But what if you want to settle your doubts and stay? What's helpful for getting past this sort of angst, besides leaving?<br />These
[…]Accountability without gradeshttp://www.mathblogging.org/post/1021472014-10-22T21:29:00-04:00Anna BlinsteinWe all want to teach for the love of learning and I bet lots of us wish that we didn't have to give grades. I firmly believe that grades should not be used for motivation, BUT, when done right, they are super useful as a way to clearly communicate what students have learned and where they need to put in more work.<br /><br />In my 10th grade classes, we are using standards based grading, and so far, it's supporting the goals that I have for my classes immensely because the grades are composed of both
[…]Trigger Warnings For Assigned Readings?http://www.mathblogging.org/post/1021462014-10-22T21:20:19-04:00Samir ChopraBy: Samir Chopra On Monday, I wrote a brief note here on Jose Saramago's Blindness, commenting on its very distinctive tragicomic style. Earlier in the day, my class had discussed--among others--parts XI and XII of the novel, two sections in which the violence and depravity in the abandoned mental hospital...Francis Galton could be kind of a jerkhttp://www.mathblogging.org/post/1021452014-10-22T21:14:24-04:00JSEAs here (from Hereditary Genius, p. 21) Every tutor knows how difficult it is to drive abstract conceptions, even of the simplest kind, into the brains of most people—how feeble and hesitating is their mental grasp—how easily their brains are mazed—how incapable they are of precision and soundness of knowledge. It often occurs to persons familiar with […]A Mile of Pi
enjoy!http://www.mathblogging.org/post/1021442014-10-22T21:06:40-04:00Unknown<br/><br/>A Mile of Pi
enjoy!Ceva’s Theorem – a neat example of ratios in geoemtryhttp://www.mathblogging.org/post/1021422014-10-22T20:36:45-04:00mjlawlerThis morning my older son and I worked through a great example problem in Art of Problem Solving’s Introduction to Geometry book. By amazing luck the section is one of the sections that Art of Problem Solving highlights on their … Continue reading →On This Day in Math - October 23http://www.mathblogging.org/post/1021412014-10-22T19:00:00-04:00Pat Ballew<br /><br />God exists since mathematics is consistent, and the devil exists since its consistency cannot be proved. <br />~Hermann Klaus Hugo Weyl<br /><br /><br />The 296th day of the year; 296 is the number of partitions of 30 with distinct parts. (Even very young students can enjoy exploring the number of partitions of integers, and the difference in the number when the parts must be distinct. The idea can be explored for very young students with number rods, etc)<br />And just reminded that 1023 is the exponent for a mole, so […]BDA 2014http://www.mathblogging.org/post/1021402014-10-22T18:31:26-04:00Jared[The following report on BDA’14 was written by my student Mahdi Zamani] [A more polished version of this report is available HERE] Recently, Mahnush and I attended a workshop on Biological Distributed Algorithms co-located with DISC 2014. The workshop consisted of 20 talks distributed in two days and focused on the relationships between distributed computing […]Tina Cardone Recaps the 2014 Northwestern Math Conferencehttp://www.mathblogging.org/post/1021392014-10-22T18:13:02-04:00Dan MeyerTina Cardone typically blogs at Drawing on Math. She attended the Northwestern Math Conference earlier this month and has recapped her first day and second two days there, including sessions on algebra, algebraic thinking, modeling, problem solving, and engagement.Math teachers at play #79http://www.mathblogging.org/post/1021372014-10-22T17:15:00-04:00Maria MillerMath teachers at play #79 blog carnival is up!<br /><br />Go check it out. I found for example these interesting resources:<br />A variation of Sudoku puzzle plus a link to many more. Spider web math art - I want to do this one with my kids.<br />Pentaflake Chaoshttp://www.mathblogging.org/post/1021382014-10-22T16:55:12-04:00Scott SteketeeDan Anderson commented on my Pentaflake post to observe that the pentaflake can also be created by a random process, sometimes called the Chaos Game. In this game you start with an arbitrary point and dilate it toward a target point that’s randomly chosen from some set of points that you’ve established. You then dilate […]PhotoMath Apphttp://www.mathblogging.org/post/1021352014-10-22T16:41:02-04:00StaffThe PhotoMath App could revolutionize math for students struggling with the subject. Here’s how it works: open the app, take a picture of the math problem, and let the app work its magic. The app shows a step-by-step problem solving approach. Click here to check out the video and read more about MicroBLINK, PhotoMath’s parent...