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Regarding the ongoing 538 discussion, it appears that we may be talking across each other in this case (from a previously mentioned comment by Kaiser Fung):"The level of rigor that Krugman and others demand requires years, perhaps decades, of research to write one piece; meanwhile, the other critique is the content is not timely. Think about the fulltime journalists he has hired  there isn't a way to pay them enough to do the kind of pieces that are being imagined. As we all know, data […]
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Qui non è la prima risposta che è sbagliata: è la risposta giusta, che è sbagliata…
Cominciamo con N=2. Prendete un quadrato, dividetelo in quadranti. Tracciate i quattro cerchi inscritti in ognuno dei quadranti. Al centro del quadrato originale, tracciate il cerchio tangente ai quattro cerchi inscritti. Non dovreste avere problemi a calcolare il raggio di [...]
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5769 = 3 x 3 x 641.5769 is the number of permutations of nine elements that have a third power equal to the identity permutation (A001470).5769 is the number of binary strings of length 14 with no substrings equal to 0001 or 1000 (A164398).5769 has a representation as a sum of two squares: 5679 = 122 + 752.5769 divides 10016  1.5769 is the number of (unordered) ways of making change for n cents using coins of 1/2, 1, 2, 3, 5, 10, 20, 25, 50, and 100 cents (all historical U.S. coinage […]
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Shakespeare a 450 ans. Peu de mathématiques dans Hamlet... mais une histoire de pari à éclaircir.

Mathématiques ailleurs
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Piste verte,
featured,
Mathématiques et littérature
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It started in 2009 when John Langford and colleagues noted that label vectors were sparse and that using techniques of compressive sensing one could reduce learning in large dimensional space. Here is a new entrant in this area:Random forests with random projections of the output space for high dimensional multilabel classification by Arnaud Joly, Pierre Geurts, Louis WehenkelWe adapt the idea of random projections applied to the output space, so as to enhance treebased
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This post is probably not so interesting unless you plan to travel to the Caribbean in a few weeks. The website for the conference is offline, so I thought I might update attendees on what might be happening, at least … Continue reading →
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As is by now wellknown, I regard the supposed opposition between static and dynamic languages as a fallacy: the latter, being a special case of the former, can scarcely be an alternative to it. I cannot tell you how many times I’ve been handed arguments along the lines of “oh, static languages are just fine, but I want […]
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A large chunk of machine learning (although not all of it) is concerned with predictive modeling, usually in the form of designing an algorithm that takes in some data set and returns an algorithm (or sometimes, a description of an algorithm) for making predictions based on future data. In terminology more friendly to the philosophy […]
Bailey, D., Borwein, J., de Prado, M.L. & Zhu, Q. (2014). PseudoMathematics and Financial Charlatanism: The Effects of Backtest Overfitting on OutofSample Performance, Notices of the American Mathematical Society, 61 (5) 458. DOI: 10.1090/noti1105
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Sometimes it’s nearly 10 pm on a Sunday night and I’m doing things like reading “Seven Ways to Reignite the Spark in Your Relationship!” and mentally searchandreplacing all the parts about a significant other with teaching math. I do think it would be worthwhile, at some point, to do something like catalogue all of the coping mechanisms […]
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A drunk man will find his way home, but a drunk bird may get lost forever.From Colloquial catchy statements encoding serious mathematics at Math Overflow.[ The serious math...A 2dimensional random walk is recurrent (appropriately defined for either the discrete or continuous case) whereas in higher dimensions random walks are not. More details can be found for instance in this enjoyable blog post by Michael Lugo. "This particular saying, by the way, is usually attributed to
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From the numbers 1, 2, … n, start by writing an odd number, and keep writing larger numbers–alternating between even and odd–until you stop at n. Call this an oddeven sequence of n. For example, if n = 3, then the only oddeven sequences are 123 and 3. If n = 8, then the sequences […]
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I have just posted online a new survey “SumofSquares proofs and the quest toward optimal algorithms” coauthored with David Steurer . The survey discusses two topics I have blogged about before – Khot’s Unique Games Conjecture (UGC) and the SumofSquares (SOS) method – and the connections between them. Both are related to the notion of meta algorithms. […]
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For a small project I needed to solve a very small QP model. As the input and output were in Excel, it made some sense to try Excel’s Solver. One of the constraints is: The way to do this is to create a cell with the sum and then use Solver.SolverAdd to add a constraint. The complete call can look like:Call Solver.SolverAdd(CellRef:=sumcell, Relation:=2, FormulaText:=1)See http://msdn.microsoft.com/enus/library/office/ff838657(v=office.14).aspxUnfortunately (for me) this did not work and I […]
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Thanks to a connection fostered by my pal Guido over at Nearpod, I found out about a unique opportunity to do global professional development in 2 minutes flat. The #2minPD project is the brainchild of Stanford fellow Melissa Pelochino, whose goal … Continue reading →
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FINALLY!!! I got 2048!!! YES!!! FUCK YEAH!!! Hey, where did my family go…
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is The Phantom Tollbooth, by Norton Juster. It describes deep issues that thoughtful educators wrestle with daily: wisdom, friendship, trust, relationships between children and adults, and most importantly, knowledge.I remember it as one of my favorite books growing up, but I hadn't reread it in years. Lately, I've taken to reading to my daughter again before her bedtime, and I decided that I would read her books I thought she should know about but might not pick up on her own. I started with
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An email I’d been anxiously hoping for arrived in my inbox on Friday night. Dear Kyle,Congratulations! We are delighted to inform you that you have been selected to join LearnZillion’s 2014 Dream Team! It was longer than that, of course, but all I really needed to read was the first line. I’m one of 200 teachers […]