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Posts

September 30, 2014

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7:11 AM | Fitbit obsessed
After you've collected data about yourself for a while, you tend to go one of two ways. You either quit …Tags: David Sedaris, Fitbit
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7:00 AM | 9900
9900 = 2 x 2 x 3 x 3 x 5 x 5 x 11.9900 is a pronic number, the product of two consecutive integers: 9900 = 99 x 100.9900 has two distinct digits in base 2 (10011010101100), base 10 (9900), base 19 (1881), and base 21 (1199), each using two digits the same number of times.9900 divides 1910 - 1.Source: Number Gossip
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5:21 AM | Why do Exterior Angles add up to 360 degrees?
Source: http://www.fromquarkstoquasars.com/20-gifs-that-teach-you-science-concepts-better-than-your-teacher-probably-can/ This is the real reason why exterior angles of a polygon add up to 360 degrees! If you shrink the polygon (which doesn’t affect the sum of exterior angles), the exterior angles eventually meet at a point, and the … Continue reading →
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5:00 AM | Map Estimation for Bayesian Mixture Models with Submodular Priors ( and slides Fourth Cargese Workshop on Combinatorial Optimization )
We saw submodularity here before, take for instance Francis Bach's slides (page 99 and up) on Structured sparsity through convex optimization , where he mentions the use of submodularity to find new regularizers).  Here is another way of using submodularity in compressive sensing: Map Estimation for Bayesian Mixture Models with Submodular Priors by Marwa El Halabi, Luca Baldassarre and Volkan Cevher We propose a Bayesian approach where the signal structure can be represented by a mixture […]
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4:57 AM | The September Statement: Some Numbers
By Carolyn Dicey Jennings --out of 460 Signatures* (including the original list), 34% are women. --in the top 50 PGR departments (worldwide ranking), an average of approximately 14% faculty signed the document. --there is little to no correlation between PGR rating and either number of signatures per department (.015) or...
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4:39 AM | Patterns
A correspondent writes:We emphasize the idea that students should approach problems in multiple ways.  This has caused me to wonder about patterns.  For example:students might conclude that 3^0=1 because of the pattern 3^4=81, 3^3=27, 3^2=9, 3^1=1orwhen the second difference is constant, students will conclude that the function is quadraticorwhen a function is concave up, the second derivative is positiveHowever, I wonder if seeing patterns leads to understanding the reasons for the […]
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4:02 AM | Sports Gamblers Work on Formulas to Winning Money During Football Season
Sports Gamblers Work on Formulas to Winning Money During Football Season: Jeff Glauser: Bill Davis, who has taught courses ranging from advanced calculus to statistics for the past two decades, decided he too no longer wanted to fall into the category of people who bet the house only to lose their shirt.   About 10 years ago, the teacher became a student, as Davis began developing a formula for predicting the outcomes of games. After meticulous research and analysis, along with numerous […]
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3:33 AM | Unizor - Probability - Random Variables - Independence
There are a few different but equivalent approaches to define independent random variables. We will use a simple approach based on the fact that we are only dealing with random variables that take finite number of values.So, assume a random variable ξ takes valuesx1, x2,..., xMwith probabilitiesp1, p2,..., pM.Further, assume a random variable η takes valuesy1, y2,..., yNwith probabilitiesq1, q2,..., qN.Let us remind that a random variable is a numeric function defined on each elementary event […]
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3:00 AM | Game Theory Tuesdays: 2×2 Matrix Game Solver
Last week instead of writing a post on game theory I ended up writing some code related to game theory. The most commonly described games are 2×2 matrix games, and in an effort to make game theory easier to understand, I developed a website that can solve any 2×2 matrix game. Here is a thumbnail […]
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1:51 AM | The more time goes by since my mother’s death, the more I need her guidance. For the first X...
The more time goes by since my mother’s death, the more I need her guidance. For the first X years I was just sad—sad for myself, sad in that primal way when you just cry like a baby, like a baby having no more complicated thought than Waaaaaah. And as well, from time to time, thoughts that were less about me and more about her: what would she be doing with her time these days, she would have laughed so hard at this movie. But—back to me again—as years pile up, I […]
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1:44 AM | Statistician Creates Model To Predict What's Next In Game Of Thrones
Statistician Creates Model To Predict What's Next In Game Of Thrones: Mark Strauss: Call it the ultimate spoiler: Richard Vale, a lecturer in the Statistics Department at the University of Canterbury, has developed a mathematical model to predict the fates of the characters in the next two Game of Thrones novels. [source: mme rss]
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1:37 AM | A year of tinkering
You really should take advantage of the free until August 2015 license that is currently being offered with a fresh download TinkerPlots. Almost a year of tinkering - would that it were freely available in perpetuity without condition.If you are a middle school teacher, then this is designed for you and yours. If, like me, you are not, you may find it fun to play with anyway.  Here is something I was playing with recently:An elementary school number sense activityIn the JUMP math […]
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1:36 AM | An intuition for concentration inequalities
I use concentration inequalities a lot in my research, and it’s about time I write a post about them. Throughout this post, will denote independent realizations of a common random variable taking values in the real line. We will take , , and The central limit theorem (CLT) essentially states that where the Q-function denotes […]
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1:10 AM | Picture of an isomorphism
We spent a very busy and enjoyable weekend with Hans Hockey, a statistician who lives in Hamilton, and his family. When we arrived, Hans showed me a picture he had taken, of the 81 SET cards laid out on a … Continue reading →
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12:28 AM | Once More: 'Intellectual Property' Breeds Confusion; Drop it
By: Samir Chopra Rarely, if ever, does the term 'intellectual property' add clarity to any debate of substance--very often, this is because it includes the term 'property' and thus offers an invitation to some dubious theorizing. This post by Alex Rosenberg at Daily Nous is a good example of this...
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12:11 AM | IntMath Newsletter: Resources, inspiring teachers, KaTeX
In this Newsletter: 1. 20 Gifs That Teach You Science Concepts 2. Make!Sense 3. MOOC: Audio Signal Processing for Music Applications 4. Inspiring teachers (8 TED talks) 5. KaTeX - a new way to display math on the Web 6. Math puzzles 7. Final thought - Why I'll Never Tell My Son He's Smart The post IntMath Newsletter: Resources, inspiring teachers, KaTeX appeared first on squareCircleZ. No related posts.
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12:11 AM | Two hour marathon in 2041
Today Dennis Kimetto ran the Berlin Marathon in 2:02:57, shaving 26 seconds off the previous world record.  That means it's time to check in on the world record progression and update my update from last year of  my article from two years ago.  The following is a revised version of that article, including the new data point.Abstract: I propose a model that explains why world record progressions in running speed are improving linearly, and should continue as long as the […]
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12:04 AM | spring-of-mathematics: Full Size & Source: 1. Fibonacci...
spring-of-mathematics: Full Size & Source: 1. Fibonacci Numbers are generated by the Pascal’s Triangle. 2. Odd and Even numbers form the Sierpinski Triangle. 3. Number’s Symmetry and the”binomial coefficient expansion” numbers. 4. Powers of 2 and 11 series. 5. Triangular Numbers.
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12:01 AM | Do These Properties Guarantee Congruence?
The activity is from a Shell Center task, and the student work is from my own class. We’re missing a few kids, but this is representative of the whole group’s work. Questions: What do you notice? Anything interesting? What categories of student responses do you see? What sort of feedback would you give to push… Continue reading →

September 29, 2014

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11:47 PM | Power laws and wealth
From Alison Griswold at Slate, reporting on the Wealth-X and UBS billionaire census (warning: obnoxious auto-playing music at the second link): “The typical billionaire has a net worth of $3.1 billion.” Does “typical” mean mean? or median? It appears that “mean” is intended, because the front page of this census says there are 2,325 billionaires […]
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11:28 PM | Love numbers? A reading list for math enthusiasts
Love numbers? A reading list for math enthusiasts: matthewmaddux: TED-Ed Blog: Ready to level up...
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11:15 PM | [DMANET] ETAPS 2015 final call for papers
****************************************************************** CALL FOR PAPERS: ETAPS 201518th European Joint Conferences on Theory And Practice of Software London, UK, 11-18 April 2015 http://www.etaps.org/2015******************************************************************-- ABOUT ETAPS --ETAPS is the primary European forum for academic and industrialresearchers working on topics relating to software science. ETAPS,established in […]
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11:05 PM | Erkenntnis.
Im Treppenhaus begegne ich Philip. Einem der größten Clowns, die ich in den letzten Jahren unterrichten durfte. “Herr Klinge, ich stehe jetzt 1 in Chemie”, erzählt er mir freudestrahlend. “Donnerwetter”, zeige ich mich beeindruckt, “wie hast du das geschafft?”Philip grinst verlegen. “Ich habe gemerkt, dass ich mich eigentlich nur regelmäßig … Continue reading →
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11:00 PM | On This Day in Math - September 30
Big whirls have little whirls,That feed on their velocity;And little whirls have lesser whirls,And so on to viscosity.~Lewis Richardson The 273rd day of the year; 273oK(to the nearest integer)is the freezing point of water, or 0oCEVENTS1717 Colin Maclaurin (1698–1746), age 19, was appointed to the Mathematics Chair at Marischal College, Aberdeen, Scotland. This is the youngest at which anyone has been elected chair (full professor) at a university. (Guinness) In 1725 he was made Professor at […]
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10:56 PM | Moths and Moth watching
Amidst the humongous number of heavenly entities existing in the universe, planet Earth deserves special mention and interest as it is the only entity that harbours and sustains life. The hardcore exponents of astrobiology might frown upon my statement and shrug me off as a cynic; but nevertheless, they too would nod their heads in Read more
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10:53 PM | Day 19: No Pictures But Still Heading in the Right Direction
In 5th grade we had a great conversation about exponents and powers of 10.  Some students have older siblings who introduced the concept to them but most had never heard of them before.  It really helped them connect the idea of place value and that the digit to the left is 10 x the digit to the right.In 6th grade we tackled word problems involving fraction and decimal division/multiplication.  We did this similar to the ratio word problems and it had almost better results! […]
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10:15 PM | Interviewing!
I know we did a post last week promoting the site.  However we'd like to do a little more - we're very excited to announce the very first released INTERVIEW.  Our written interview is from a Math Intervention Teacher.  We hope you're interested in purchasing and reading, for only $1.99.  First Written Interview!Please share your story with us as well!http://www.notaprodigy.com/interviews---love-math.htmlHopefully we have many more to come!
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10:14 PM | The Unimaginable Mathematics of Borges’ Library of Babel [book review]
This is a book I carried away from JSM in Boston as the Oxford University Press representative kindly provided my with a copy at the end of the meeting. After I asked for it, as I was quite excited to see a book linking Jorge Luis Borges’ great Library of Babel short story with mathematical […]
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10:00 PM | SMP-2 Reason Abstractly and Quantitatively #LL2LU (Take 2)
We want every learner in our care to be able to say I can reason abstractly and quantitatively. (CCSS.MATH.PRACTICE.MP2) But…What if I think I can’t? What if I have no idea how to contextualize and decontextualize a situation? How might we offer a pathway for success? We have studied this practice for a while, making […]
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9:59 PM | Pictionary in Stats
I tortured my learners with a game, a game that was awesome and they all agreed was worth while. We played a Stats Pictionary! I used this document.  Ch 5 – various distributions- Pictionary   I created these distributions using the Illuminations Applet called plopit.   http://www.shodor.org/interactivate/activities/PlopIt/ Here are my rules: 1. Each pair gets one […]
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