Mathblogging.orgRecent Postshttp://www.mathblogging.org/scripts/feed.php20141031T10:01:4904:00No copyright asserted over individual posts; see original posts for copyright and/or licensing.Mathblogging.org Atom serializer8666http://www.mathblogging.org/post/10278520141031T03:00:0004:00Mathematical Association of America8666 = 2 x 7 x 619.<br /><br />8666 has a 9th root whose decimal part starts with the digits 1 to 9 in some order.<br /><br />8666 is a beastly number (A051003).<br /><br />8666 is the number of permutations of length 21 that avoid the patterns 123 and 4312 (A116699).<br /><br />8666 is a number n such that n, n + 1, n + 2, and n + 3 are not divisible by any of their nonzero digits (A244358).<br /><br />8666 is a number n such that n ends with 6 and is the difference of cubes in at least one way (A038861).<br /><br /><br />Source: What's Special About This Number?How it Must Feelhttp://www.mathblogging.org/post/10278420141031T02:24:0804:00UnknownImagine yourself as a student who has always had a hard time with math. Honestly, you are not even sure why there are sometimes multiple variables in the same formula. When the teacher starts a new topic, you may need to see it 4 different ways and have it be repeated a lot of times in order to become somewhat proficient at the skills involved, even though the general idea is sometimes (not always) accessible to you. When other people discuss mathematics in groups, the speed at which they are […]Just because you use video doesn't mean you've flipped your class. And just because you don't like the "flipped classroom" doesn't mean you shouldn't use video.http://www.mathblogging.org/post/10278320141031T01:56:0004:00Crystal KirchLong title. I know. It's late and I couldn't think of a shorter one. Think of it as a title/thesis statement all in one.<br /><br />~~<br /><br />I am finding more and more that people in education use the word "flip" to refer to anytime students watch an instructional video. That's frustrating to me.<br /><br />For me, flipping my classroom was about<br />finding a way to support my students more in their learning, and to<br />better differentiate my instruction and time with them. It was about<br />getting out of the front of
[…]Nuit Blanche in Review ( October 2014 )http://www.mathblogging.org/post/10290420141031T01:30:0004:00IgorSince the last Nuit Blanche in Review ( September 2014 ), we had another Way of Reading Nuit Blanche, saw Once Thought Impossible Computations, read a few Blogs in 78 Summer Hours and found quite a few implementations:<br />Nonlinear Causal Inference using Gaussianity MeasuresBRTF: Robust Bayesian Tensor Factorization for Incomplete Multiway Data SparsePR: Robust Sparse Phase Retrieval Made Easy Compressed Manifold Modes for Mesh Processing On Sparse Representation in Fourier and Local Bases RQS
[…]Decomposing Numbershttp://www.mathblogging.org/post/10278220141031T01:00:0004:00(x, why?)(Click on the comic if you can't see the full image.)<br /> (C)Copyright 2014, C. Burke.They're decomposing numbers ... there's less of them every year ... Happy Halloween! <BR><br><br><br></br>
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Thesis: On optimal Sampling in low and high dimension, Alexandra Carpentierhttp://www.mathblogging.org/post/10278020141031T01:00:0004:00Igor On optimal Sampling in low and high dimension by Alexandra CarpentierDuring my PhD, I had the chance to learn and work under the great supervision of my advisor Remi (Munos) in two fields that are of particular interest to me. The se domains are BanditTheory and Compressed Sensing. While studying these domains I came to the conclusion that they are connected if one looks at them trough the prism of optimal sampling. Both these fields are concerned with strategies on how to sample
[…]Quitting Big Bang Theoryhttp://www.mathblogging.org/post/10278120141031T00:37:1504:00abrandnewlineIt started last summer, I was talking to my dad, who had just started watching The Big Bang Theory online, and he compared the boys on the show to my brother and his friends. You see my brother has had the same group of friends since high school, and they are by most people’s standards, […]Your Most Memorable IBL Experience (Video)http://www.mathblogging.org/post/10277920141031T00:13:0004:00Stan YoshinobuAt the RLM and IBL Conference last June, we asked a handful of IBL instructors to tell us about one of their most memorable IBL experience. Here they are in their own words.<br /><br /><br />What is one of your most memorable IBL experience?Quantization as Deformationhttp://www.mathblogging.org/post/10277720141030T23:45:4404:00zx31415Very early in my study of physics, Weyl became one of my gods. I use the word “god” rather than, say, “outstanding teacher” for the ways of gods are mysterious, inscrutable, and beyond the comprehension of ordinary mortals. […]Income inequality, social mobility, and sample sizehttp://www.mathblogging.org/post/10277820141030T23:26:5504:00Michael LugoMatt O’Brien at the Washington Post’s Wonkblog has an infographic that contains the following information: quintile of income distribution first second third fourth fifth % of college graduates from poor families 16 17 26 21 20 % of high school dropouts from rich families 16 35 30 5 14 This comes from a paper entitled […]Q: Why radians?http://www.mathblogging.org/post/10277420141030T23:13:1104:00The PhysicistPhysicist: Because calculus. When you first start doing trigonometry the choice between radians, degrees, turns, or hexacontades is a matter of personal preference. Most people use degrees because most other people use degrees (and other people seem pretty on the … Continue reading →Octobre, 5ème défihttp://www.mathblogging.org/post/10277520141030T23:00:0004:00Ana RechtmanChaque semaine, un défi du calendrier mathématique 2014...

Défis du Calendrier Mathématique 2014
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CarrouselBailey (Bailinho Rodriguez Klinge)http://www.mathblogging.org/post/10277620141030T22:41:0004:00JanMartin KlingeEs klingelt. Nichtsahnend öffne ich die Tür und sehe einen völlig Fremden vor mir. Einen Fremden, der gelassen unseren Hund am Nacken zur Haustür geschleppt hat. Mein Blick wandert von ihm zum Hund und wieder zurück. ”Hi”, stellt er sich vor. “Ich besuche eure Nachbarn – und Bailey ist in … Continue reading → Neil White: 1945 – 2014http://www.mathblogging.org/post/10277320141030T22:38:0304:00Guest ContributorGuest post by Gary Gordon Those with memories of Neil White are invited to share them in the comments below. Neil White passed away on Aug. 11, 2014. Neil was an inspiring teacher and one of the key contributors to … Continue reading →Polygonal Numbershttp://www.mathblogging.org/post/10277120141030T22:21:5904:00samjshahI just finished up arithmetic series, and I wanted to push my Advanced Precalculus students to think hard. I usually provide them with enough scaffolding that I know they will be able to get from Point A to Point B. But today I decided I wanted to “be less helpful.” I told the groups to […]Jobs at Amazonhttp://www.mathblogging.org/post/10277220141030T22:13:5404:00Rob J HyndmanI do not normally post job adverts, but this was very specifically targeted to “applied time series candidates” so I thought it might be of sufficient interest to readers of this blog. Here is an excerpt from an email I received from someone at Amazon: Amazon is aggressively recruiting in the data sciences, and we […]twocubes:
anewkindofmagic:
twocubes:
aeneida:
twocubes:
cute...http://www.mathblogging.org/post/10277020141030T21:01:0704:00Unknown<br/><br/>twocubes:
anewkindofmagic:
twocubes:
aeneida:
twocubes:
cute!
I want to prove this but I don’t know where to start
hint:
I got in quite a mess of algebra when I did this. Curse the sum of squares formula and all its works.
Alternate way I found: consider the pairs of squares on both sides , starting with the largest. Take the smaller from the bigger, and add these differences. We want to prove that this is equal to the square of n(2n+1). For instance, (14^212^2)+(13^211^2)=10^2.
[…]Mathematics Subject Special Updatehttp://www.mathblogging.org/post/10276620141030T20:00:0304:00Colleen YoungThe UKEdchat Mathematics Subject Special took place on Thursday 23rd October and the Session page has been updated with the complete chat. Note that you do not need a Twitter account to view any of the links mentioned in the … Continue reading →On This Day in Math  October 31http://www.mathblogging.org/post/10276920141030T20:00:0004:00Pat Ballew<br />*The image is a pumpkin carved a few Halloweens ago by Sonja L. One of my Stats/Calc students (and a really good Bassoonist, Bassooner, Bassoonenough)<br /><br />It is true that a mathematician who is not somewhat of a poet, will never be a perfect mathematician. ~Karl Weierstrass<br /><br /><br />The 304th day of the year; 304 is the sum of six consecutive primes starting with 41, and also the sum of eight consecutive primes starting with 23. (and for those who keep up with such things, it is also the record number of […]A Frenzy of Marking: 'Progress Over Time'http://www.mathblogging.org/post/10276820141030T19:54:0004:00Mr. P. CollinsThe first half term of the school year has seen us embark on a newer emphasis on 'progress over time' and a need for students' exercise books to be glistening with not only marked work, but 'learning dialogues/conversations' including students' responses to our WWW/EBI comments. This, is also (as I found out in an observation the last week of the half term), coupled with students needing to show knowledge of their previous learning when quizzed during the lesson observation by my observers: if […]November 1, 2014 – Dr. Titu Andreescu – Problem Solving Sessionhttp://www.mathblogging.org/post/10276520141030T19:50:1304:00Metroplex Math CircleCome join us November 1st and hone your skills for this year’s problem solving season. AMC 8 is this month, making it a great time to delve into various interesting problems. Combinatorics, Number Theory, Geometry, and Algebra problems will be presented with multiple difficulty levels to challenge and delight our math circle patrons. Whether you […]Why the Chess Computer Deep Blue Played Like a Humanhttp://www.mathblogging.org/post/10276320141030T19:48:0004:00UnknownWhy the Chess Computer Deep Blue Played Like a Human: David Auerbach:
The usual way a computer plays chess is to consider various move possibilities individually, evaluate the resulting boards, and rank moves as being more or less advantageous. Yet for games like Go and Twixt, this approach breaks down. Whereas at any point in chess there are at most a couple dozen possible moves, these games offer hundreds of possible moves (thousands in the case of Arimaa, which was designed to be a
[…]CfP: ICCP 2015  IEEE International Conference on Computational Photographyhttp://www.mathblogging.org/post/10276720141030T19:25:0004:00Igor<br /><br />Jason Holloway just sent me the following note<br /><br />Hi Igor,<br />We are announcing the call for papers for ICCP 2015. Can you help disseminate the CFP to your readers? (Or link to our Google+/Facebook page?)<br />Thanks!~Jason (on behalf of the program committee for ICCP 2015)<br /><br />IEEE International Conference on Computational Photography ( ICCP 2015  http://iccp.rice.edu/ ) seeks high quality submissions in all areas related to computational photography. The field of Computational Photography
[…]label switching in Bayesian mixture modelshttp://www.mathblogging.org/post/10276220141030T19:14:2004:00xi'anA referee of our paper on approximating evidence for mixture model with Jeong Eun Lee pointed out the recent paper by Carlos Rodríguez and Stephen Walker on label switching in Bayesian mixture models: deterministic relabelling strategies. Which appeared this year in JCGS and went beyond, below or above my radar. Label switching is an issue […]Trouble with numbershttp://www.mathblogging.org/post/10276420141030T19:06:0304:00srcavI’ve just finished watching ITV Tonight’s episode from this evening entitled “Trouble with numbers”. The show was highlighting the problem we have in this country with maths ability in Adults. I found it pretty interesting, and if you missed it I would certainly suggest catching up on it. There were a number of things highlighted […]I Spy II: Class Activityhttp://www.mathblogging.org/post/10276020141030T18:12:0004:00Shelley Carranza This post gives a
[…]Halloween nel nome della chimica: effetto... spumeggiante!!!http://www.mathblogging.org/post/10275920141030T18:04:0004:00Chris SorrentinoAnche se non è una ricorrenza italiana, Halloween può diventare un'utile occasione per imparare qualcosa di nuovo a scuola ed acquisire un po' di manualità. Abbiamo visto, qualche anno fa, le opere d'arte matematiche realizzate con le zucche dagli studenti del dipartimento di Matematica della Denison University a Granville, in Ohio, utili per realizzare divertenti attività interdisciplinari tra matematica ed arte, ma quest'anno voglio proporvi qualcosa che abbia più attinenza con le
[…]Ένας μεταγρίφος λογικής με ολίγη άλγεβρα,μια έμμετρη διένεξη του Πασκάλ με το Καρτέσιο και μια συναρπαστική ομιλία για την δικανική δομή των στοιχείων του Ευκλείδηhttp://www.mathblogging.org/post/10276120141030T18:03:0004:00Αθανάσιος Δρούγας<br /><br /> <br />"Ένας μαθηματικός,που δεν είναι λίγο
[…]I Spy: An Introduction to Triangle Congruencehttp://www.mathblogging.org/post/10275820141030T17:28:0004:00Shelley Carranza <br />Below is an
[…]SBG explained to Parentshttp://www.mathblogging.org/post/10275620141030T17:16:4804:00Frank McGowanI work in a school that has a 15 grading scale yet many practices are aligned with a percentage / grade letter model. We’re working towards a more common understanding that may eventually shift descriptors but in meantime I find … Continue reading →