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Posts

November 28, 2014

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6:48 AM | Time-Lapse
The last day of classes before Thanksgiving break, I set up my iPhone in an attempt to record some time-lapse footage in each of my classes.  Since middle-schoolers can smell a camera a mile away, there was nothing secretive about … Continue reading →
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6:39 AM | IntMath Newsletter: Vectors activity, GeoGebra 5
In this Newsletter: 1. Math in cross-wind landing vectors applet 2. GeoGebra 5 now with 3-D graphs 3. Math puzzles 4. Final thought - thank you The post IntMath Newsletter: Vectors activity, GeoGebra 5 appeared first on squareCircleZ. No related posts.
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6:00 AM | Quelle est votre équation préférée ?
Nous présentons le livre « Fous d'équations. Les 24 plus belles équations de l'univers » de Dana Mackenzie. - Billets des habitués
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6:00 AM | Polygones convexes : le problème de la fin heureuse
Voici une présentation du problème de la fin heureuse, plus connu en français (et sans doute en hongrois) sous le nom du happy end problem. - Echos de la recherche / Piste rouge, featured
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6:00 AM | CS Internship in France: Compatibilité de l'apprentissage par représentations parcimonieuses et de la compression avec pertes / Compatibility between sparse machine learning and lossy compression
Laurent Duval just put out this announcement (in French and to be translated in English soon) :Internship (2015): learning / compression compatibility Intitulé de stageCompatibilité de l'apprentissage par représentations parcimonieuses et de la compression avec pertes [français] (5-6 mois, premier ou second semestre 2015)  Internship subject titleCompatibility between sparse machine learning and lossy compression [English, Coming soon] (5-6 months, 2015, first or second semester) […]
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5:15 AM | GeoGebra now with 3D graphs
GeoGebra's latest version offers 3D graphs and output that can be viewed on tablet devices. Here's a quick overview. The post GeoGebra now with 3D graphs appeared first on squareCircleZ. Related posts: Math in cross-wind landing vectors applet Here we look at some of the math behind... How to code JSXGraph axes, ticks and grids Trying to code JSXGraph so the axes and grid... Updated Graphs of tan, cot, sec and csc The updated applets on the Graphs of tan, cot,...
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3:20 AM | 54th Annual Northwest Math Conference: Scaling New Heights
54th Annual Northwest Math Conference: Scaling New Heights: Registration is now underway for the 54th Annual Northwest Math Conference: Scaling New Heights, which runs October 22-24, 2015 in Whistler, BC. See you there.
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3:17 AM | The New Way to Save Money: Playing the Lottery
The New Way to Save Money: Playing the Lottery: Amos Zeeberg: But some lottery players have found a way to get the thrill of gambling while also making the prudent choice to save a chunk of each paycheck. This is thanks to “prize-linked savings accounts”—each time an account-holder deposits a certain amount, they get a ticket for a raffle that includes cash prizes of various amounts. […] [source: mme rss]
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3:00 AM | Game Theory In The News (November 2014)
This is the current installment of the monthly series “Game Theory in the News.” My hope is to highlight stories that can be used as case studies in the classroom, both so students can see how to apply game theory and so teachers can make class material easier to relate to. You can get these […]
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3:00 AM | Novembre, 4ème défi
Chaque semaine, un défi du calendrier mathématique 2014... - Défis du Calendrier Mathématique 2014 / Carrousel
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2:47 AM | More Cartoons on Kids, Adults, and Technology
Originally posted on Larry Cuban on School Reform and Classroom Practice:After nearly two years of once-monthly cartoons, readers and friends (and, yes, even family) send me their favorites. The eternal struggle of adjusting to each new technology gives cartoonists…
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1:00 AM | Good Maths Teachers…
I am very happy to announce that on Monday Dec 1st I’ll be asking someone else for his thoughts on Mathematics education – Simon Singh, whose book ‘The Simpsons and Their Mathematical Secrets’ was published in paperback recently (and is a … Continue reading →
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12:34 AM | IXL: Piattaforma Educativa Per La Matematica, Dall'Età Prescolare Alla Secondaria Di 2° Grado
In rete, sono presenti numerose risorse dedicate alla Matematica. Tra queste si distingue IXL, una piattaforma educativa americana che offre ottimi contenuti adatti alle esigenze degli studenti, dall'età prescolare alla Secondaria di 2° grado!La piattaforma offre Maths skill (abilità matematiche), continuamente implementate ed arricchite, fruibili online. Qui la mappa dell'offerta, distribuita in quattordici tappe progressive, dalle Preschool skills (abilità in età prescolare) […]
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12:26 AM | Week 16
Bereken exact de oppervlakte van de halve cirkel. Oplossing week 16
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12:00 AM | On This Day in Math - November 28
Newton is, of course, the greatest of all Cambridge professors; he also happens to be the greatest disaster that ever befell not merely Cambridge mathematics in particular, but British mathematical science as a whole.~Leonard RothThe 332nd day of the year; 332 is the number of ways to partition 47 into non-zero triangular numbers.  (36 + 10 + 1 would be one) The sum of the first 332 primes is a prime.EVENTSIn 2348 BC, a supposed comet under divine guidance passed near Earth, causing […]

November 27, 2014

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11:14 PM | Le Monde puzzle [#887quater]
And yet another resolution of this combinatorics Le Monde mathematical puzzle: that puzzle puzzled many more people than usual! This solution is by Marco F, using a travelling salesman representation and existing TSP software. N is a golden number if the sequence {1,2,…,N} can be reordered so that the sum of any consecutive pair is a […]
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10:57 PM | Λογικός γρίφος για γερά ..νεύρα
                    […]
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7:47 PM | Fields due to a moving linear charge
References: Griffiths, David J. (2007), Introduction to Electrodynamics, 3rd Edition; Pearson Education – Problem 10.19. In his example 10.4, Griffiths works out the fields due to a point charge moving with constant velocity . They are where is the vector from the particle’s present (not retarded) position to the observer (assuming the particle passes through […]
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7:30 PM | Hawk moths and impossible geometry
Hawk moths and impossible geometry   by Gebefreniya   http://im-possible.info/english/art/pencil/gebefreniya.html   Author - http://gebefreniya.deviantart.com/
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7:08 PM | The Return of Practice Standard #6
    Thanksgiving means many things...Turkey and trimmings...the Macy's parade...Detroit Lions football...and, at least in my house...     I have documented the importance of Practice Standard 6, Attend to Precision, in a previous post.  In that case, the failure to demonstrate proficiency led to disastrous consequences.  Here, it's a different story.    Early on in the movie, Santa comes to Toyland to check on his Christmas orders.  The […]
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7:02 PM | Fields of a point charge moving in one dimension
References: Griffiths, David J. (2007), Introduction to Electrodynamics, 3rd Edition; Pearson Education – Problem 10.18. Here’s a simple example of calculating the fields due to a moving point charge. Suppose we have a charge constrained to move on the axis in the direction, so that . The fields are where and is the particle’s position […]
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7:00 PM | Bulletproof graphene makes ultra-strong body armour
Sheets of single-atom thick carbon absorb the impact of bullets more efficiently than steel, paving the way for lightweight, super-strong bulletproof vests
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6:44 PM | 다시 찾은 낙산공원 – 광각렌즈 사망
오랜만에 카메라와 렌즈를 꾸역꾸역 들고 우리 마을 뒷산인 낙산공원을 탐방하고 왔다. 나름 여기 주민인데 한 번 탐방해 줘야지..! 이번에는 혜화동 로터리와 한성대입구역 사이로 성곽길이 존재하길래 그 쪽으로 진입해 보았다. 아래는 구체적으로 이동한 경로: 성곽길을 따라 걷는데 오른쪽의 성곽보다는 왼쪽으로 보이는 … Continue reading →Related Posts ?[학교생활] […]
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6:42 PM | Q: When “drawing straws” is it better to be first or last?
Physicist: As long as the person who cut the straws: 1) takes the last remaining straw and 2) has a decent poker face (or doesn’t know which is which), then it’s completely fair.  If they have a bad poker face, … Continue reading →
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6:37 PM | Fields of a moving point charge
References: Griffiths, David J. (2007), Introduction to Electrodynamics, 3rd Edition; Pearson Education – Problems 10.17. We can use the Liénard-Wiechert potentials for a moving point charge to calculate the fields produced by the charge. The potentials are where is the position of the particle at the retarded time and is the velocity at the same […]
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6:27 PM | Cause, effetti e bias
non sempre le cose sono come sembrano. Prendiamo l'esempio del liceo classico....statistica, bias, correlazione, Piero AngelaThe post Cause, effetti e bias appeared first on Il Post.
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6:14 PM | Thanksgiving power law
In honor of Thanksgiving: take a look at Niall MacKay’s paper Of bombs and boats and mice and men: a random tour through some scaling laws. I mention this because one of the scaling laws there is the time it … Continue reading →
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4:45 PM | Enid Blyton–Relikt vergangener Zeiten.
Nachdem wir die SAMS Bücher durchgelesen haben, versuche ich Carolina für Enid Blyton zu begeistern. Was habe ich ihre Bücher als Kind verschlungen. Fünf Freunde. Geheimnis um. Rätsel um. Die Schwarze Sieben. Sogar Hanni und Nanni habe ich gelesen.Und immer ging es um kluge Kinder, die Verbrechen lösen und Geheimnissen … Continue reading →
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3:11 PM | A new function which is a counter-example to a conjecture found
For this conjecture there was found a counter-example, see this online article. The counter-example states that for funcoid . This way I discovered a new function defined by the formula . While and have many cryptomorphisms (that is different but equivalent definitions) and lots of useful usages, all is known about is its definition and […]
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2:56 PM | Girls are Great at Math! (Video)
By now, most of us know that girls have great math skills. Still, there are some folks out there who are holding on to the bias that boys naturally have better math abilities than girls. In my latest Math Manifesto video, I go through some of the recent research on gender and math. It’s good news […]
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