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Posts

August 28, 2015

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10:14 AM | Knotty network could have powered universe’s early growth spurt
The theory behind why cables get tangled could explain both cosmic inflation and why we experience only three dimensions of space
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9:48 AM | Fraction/Decimal Grids
Interactive grids for working with fractions or decimals visually. Allows you to add/subtract or multiply.
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9:00 AM | Wrong, But Useful, Episode 28
In this month’s exciting instalment of Wrong, But Useful, @reflectivemaths and @icecolbeveridge discuss: The number of the podcast: 36.16 seconds, the current world record for sorting a pack of cards Dave is reading The Number Devil: A Mathematical Adventure — and asks what happens if you colour in the multiples of five (and Colin gets it wrong) Colin has been reading @standupmaths’s Things to Make and Do in the Fourth Dimension, and enjoyed the Calkin-Wilf Tree (not the […]
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8:25 AM | [DMANET] WCTA call for participation
Dear Colleague,The programme for the 2015 Workshop on Compression, Text and Algorithms (WCTA) is now available athttp://www.dcs.kcl.ac.uk/events/spire2015/wcta_programme.html .The workshop will take place at King's College, London, on Friday next week--- i.e., September 4th, the day after the Symposium on String Processingand Information Retrieval (SPIRE).WCTA will feature an invited talk on "Using Suffix Array Based DataStructures in Computational Genomics" by Richard Durbin, […]
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8:24 AM | Odometer, the Universe and trains
Today in class, Year 7, I linked to decimals: the odometer in my car... rounding 19.999 to 2 decimals places is like 19999 on the odometer kicking over to 20000 π... and the universe trains terminating at the end of the line Luna Park, because trains terminate behind Luna Park and of course, Arnie, the Terminator.
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7:49 AM | 5 Maths Gems #39
Hello and welcome to my 39th gems post. This is where I share five maths teaching ideas I've seen on Twitter. This will be my last post of the summer holidays - I've been a busy blogger this summer but lesson planning takes priority this weekend. We all know how manic things get at school in September. 1. Bojagi I'm excited about this. Dave Radcliffe (@daveinstpaul) has created a multiplication
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7:30 AM | Mr. B's Brain-O Quiz # 22
8/28/2015 Mr. B’s “BRAIN-O” QuizGuaranteed to unclog clogged up […]
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7:24 AM | Inequality in Rectangle
Point I lies within the rectangle ABCD. Lines AI, BI, CI, DI meet the sides of the rectangle in points M, N, P, Q. Prove that AI+BI+CI+DI is not less than MI+NI+PI+QI.
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7:01 AM | Minimum Wage Machine pays in pennies
Crank to earn a penny every 4.5 seconds.Tags: minimum wage, perspective
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6:35 AM | An Open Letter and a Note of Gratitude
“I’ve been married for forty-two years which means I’ve been to forty-two state fairs.”  I’m not sure why this little tidbit from the Park-and-Ride attendant didn’t instantly put me in great spirits. And then I walked up over the hill, took one look at Math-on-a-Stick, and the indifference melted.  The humble smile of satisfaction from Christopher […]
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5:11 AM | QI Card Shuffling - 52 Factorial
Stephen Fry explains that a standard deck of cards can be shuffled in 52! different ways.
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5:00 AM | 4.1.18
- Figures sans paroles / Les figures sans paroles
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5:00 AM | Mash: Fast genome distance estimation using the MinHash algorithm - implementation -
In this Sunday Morning Insight: What Happens When You Cross into P Territory ?, I mentioned this article on using LSH for genome alignment from long read technology (PacBio RS II or Oxford Nanopore MiNion).Assembling Large Genomes with Single-Molecule Sequencing and Locality Sensitive Hashing by Konstantin Berlin, Sergey Koren, Chen-Shan Chin, James Drake, Jane M Landolin, Adam M Phillippywhile assembling the genome is important, with cheap and fast long reads, the goalpost is now slowly moving […]
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4:50 AM | TGIF
Thank God it’s Friday.  She’s a nice lady for making it so because I really only have one day left in me.
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4:30 AM | Cancellation is a Pain
How to avoid the pain of estimating tough sums Cricketing source Andrew Granville is a number theorist, who has written—besides his own terrific research—some beautiful expository papers, especially on analytic number theory. Today Ken and I wish to talk about his survey paper earlier this year on the size of gaps between consecutive primes. The […]
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4:12 AM | The Loop Game: Pool in Elliptical Table
Mathematics enthusiast and author Allex Bellos has created an elliptical pool table and he named it “The Loop Game.” It was supposed to always make the ball go to the table pocket. This can be done by placing the pocket at one of the foci and hitting the ball placed on the other focus. This is easy to […] Math and Multimedia - School math, multimedia, and technology tutorials.
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4:00 AM | Renew your CMS membership today!
The CMS recognizes the important role members play in strengthening the Canadian mathematics community and relies on the continued support of its members. Members help support CMS programs and activities, including meetings, math camps, national prizes and awards, competitions, such as the International Mathematical Olympiad (IMO), and publications. Renew your membership online by clicking more.
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2:57 AM | Octahedral Moondog
Located in the National Gallery of Art's Sculpture Garden, Tony Smith's Moondog is based on a lattice of tetrahedral and octahedral components (15 stretched octahedra and 10 tetrahedra). As described by George Hart, you can think of the structure as part of a diamond crystal lattice, with the smaller tetrahedral faces (visible as equilateral triangles) representing carbon atoms and the
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2:49 AM | [DMANET] SI of Springer CASM (Thomson Reuters Indexed) on Modeling Complex Communication Networks
http://www.casmodeling.com/about/update/COMM_NETS**--NEW--** Thomson Reuters indexed in the Web of Science (ESCI) startingNovember 2015Thematic series on modeling large-scale/complex communication networks usingcomplex networks and agent-based modeling techniquesComplex Adaptive Systems Modeling welcomes submissions to the new thematicseries on Modeling large-scale communication networks using complex networksand agent-based modeling techniques.Key features of Springer CASMDeadline for […]
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2:13 AM | Bayesian inference in a nut...bag
Suppose you are in a Kindergarten class, and you have a bag containing 100 mixed nuts, Brazil, Walnut, Almond, Hazelnut, etc. Now one of the children reaches in, pulls out a nut, and tells you what kind it is. How much does it weigh? Let's make the assumption that the nuts remaining are not radically […]
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2:00 AM | Août 2015, 4ème défi
Défi du calendrier mathématique 2015 : petit problème à résoudre…. - Défis du Calendrier Mathématique / Actualité
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12:42 AM | The first week or so
I've been in my new job for 8 days.  It's been a huge adjustment and I am most definitely not in love with the new job yet. The first four days back were just for staff.  I spent that time trying to make inroads with the teachers I'll be supporting this year.  I visited classrooms, offered my help, and was asked a barrage of questions that I mostly couldn't answer.  Thursday night was back to school night, though it was really more of a meet-and-greet because we didn't […]
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12:42 AM | #MTBoSBlaugust 27: Go Formative ... a cool site!
Today I introduced absolute value functions using estimating the gallons of coffee in the world's largest coffee cup 3-act math task.  Kids got into the activity!Then we practiced building absolute value functions - identifying the two linear functions; restricted the domain and range, and wrote the absolute value function.  We used +Formative !  It was awesome!Activities are super easy to build.  From the teacher's view you can see the whole class, mark work, and […]
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12:06 AM | curiosamathematica: The sums of the reciprocals of the binomial...
curiosamathematica: The sums of the reciprocals of the binomial coefficients over successive diagonals in Pascal’s triangle converge into beautiful patterns, apart from the first and second diagonal (which lead to the series 1 + 1 + 1 + 1 + … and the harmonic series, respectively). A proof of the identity can be found on cut-the-knot.org.
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12:00 AM | Via. 
Via. 
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12:00 AM | China Stock Market Crash
The Chinese Market Crash in context. How big is the market, how many investors does it have and does it tell us anything about the wider Chinese economy? Eight Million Foreigners Are there really eight million foreigners in the UK? What does 95% less harmful actually mean? E-cigarettes are 95% less harmful than ordinary cigarettes according to last week's report by Public Health England. But what does this mean? The number was arrived at using something called 'multi criteria […]
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12:00 AM | Natural language processing of new jokes from 2015
This is a brief update to a previous post: “Python, natural language processing and predicting funny”. In that post I carried out some basic natural language processing with Python to predict whether or not a joke is funny. In this post I just update that with some more data from this year’s Edinburgh Fringe festival. Take a look at the ipython notebook which shows graphics and outputs of all the jokes. Interestingly this year’s winning joke is not deemed funny by the basic model […]

August 27, 2015

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11:41 PM | Multiple Representations v. Best Representation
This is from a worksheet I assigned during my last year in the classroom: There are lots of good reasons to ask students for multiple representations of relationships. But I worry that a consistent regiment of turning tables into equations into graphs and back and forth can conceal the fact that each one of these […]
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11:38 PM | 29 Going On 30
     This September marks the start of my 30th year teaching.  What was happening 29 years ago, September 1986?President Ronald Reagan, midway through his second term, appointed Trenton, New Jersey native Antonin Scalia to the United States Supreme Court.   He is now the court's longest serving justice.The Oprah Winfrey Show made its national television debut."Crocodile" Dundee was released.  It was the second highest grossing film of the year, right behind Top […]
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11:00 PM | On This Day in Math - August 28
As long as algebra and geometry have been separated, their progress have been slow and their uses limited; but when these two sciences have been united, they have lent each mutual forces, and have marched together towards perfection. ~Joseph Louis LagrangeThe 240th day of the year; 240 has more divisors (20 of them) than any previous number. What would be the next number that has more?240 is the product of the first 6 Fibonacci numbers  240 = 1*1*2*3*5*8    *Derek […]
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