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Posts

September 01, 2014

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5:03 AM | A new candidate for worst figure
Today I read a paper that had been submitted to the IJF which included the following figure along with several similar plots. (Click for a larger version.) I haven’t seen anything this bad for a long time. In fact, I think I would find it very difficult to reproduce using R, or even Excel (which is particularly adept at bad graphics). A few years ago I produced “Twenty rules for good graphics”. I think I need to add a couple of additional rules: Represent time changes using lines. Never […]
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5:00 AM | The Long Post of the Summer
Here are quite a few papers that appeared on ArXiv and other journals this Summer:Linear time Principal Component Pursuit and its extensions using ℓ1 filtering by Risheng Liu, Zhouchen Lin, Zhixun Su, Junbin Gao In the past decades, exactly recovering the intrinsic data structure from corrupted observations, which is known as Robust Principal Component Analysis (RPCA), has attracted tremendous interests and found many applications in computer vision and pattern recognition. Recently, […]
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4:31 AM | "An astounding 26 percent of black males in the United States report seeing someone shot before..."
“An astounding 26 percent of black males in the United States report seeing someone shot before turning 12. Conditional on reported exposure to violence, black and white young males are equally likely to engage in violent behavior.” - Aliprantis, Dionissi, 2014. “Human Capital in the Inner City,” Federal Reserve Bank of Cleveland, working paper no. 13-02R.
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4:09 AM | Regular polytopes, 1
One of the topics I am thinking about with Dimitri Leemans at present concerns regular polytopes. He and his co-authors Maria Elisa Fernandes and Mark Mixer have produced some nice results and a tantalising problem about these objects. I will … Continue reading →
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4:00 AM | Revue de presse septembre 2014
Cet été, il a été beaucoup question dans la presse de médailles (Fields) et de leur revers (la crise que l'enseignement des mathématiques continue de traverser). Plongez avec nous dans les nombreux portraits de mathématicien-ne-s, médaillés ou non, constatez la crise sans défaitisme, puis venez fêter les initiatives qui à chaque point du globe rendent les mathématiques plus vivantes que jamais. Bonne rentrée à tous ! - Actualités / featured
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3:00 AM | Monday Puzzle: Probabilistic Holidays
Today is Labor Day, an annual holiday in America and Canada to honor workers. America and Canada happen to be in the minority here, as over 80 countries observe a Labour Day holiday linked with International Workers Day on May 1. The date holidays are observed is often arbitrary, and today’s puzzle imagines a probabilistic […]
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3:00 AM | Review: The Knight's Tour: A Scenic Journey
One of my favorite mental challenges, as many regular Grey Matters readers know, is the Knight's Tour. The challenge is, using only the chess knight's L-shaped move, to land on each of the 64 squares once. Mentalist Richard Paddon recently released a download resource titled The Knight's Tour: A Scenic Journey. In this post, I'll take a close look at this new take on a classic feat. We'll start
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2:26 AM | Factoring like a Pro
Most people think that Factoring is a boring topic. They don’t know the real essence and wide applications of this topic. Factoring is very useful in solving equations, simplifying common core mathematics, and more.... The post Factoring like a Pro appeared first on Techie Math Teacher.
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2:02 AM | Another Reason for Twitter
Hey everyone, I’m getting worse at keeping my blog updated… I’ve been wanting to add something to this for a while because I haven’t liked that the first post people see when they come here starts with ‘Shameless Promotion!’. That’s just tacky. So – in an effort to move that from the top of my front […]
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1:37 AM | Infolinks 2014
Infolinks account verification The post Infolinks 2014 appeared first on Techie Math Teacher.
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1:31 AM | A Case Study in Musical Memory and Past Lives
[I just made this giant tech post on the eleVR blog about audio for VR film, which got me in the mood for a post with actual audio included in it. Sorry for neglecting you, regular blog!] This is a story about two piano pieces. Memory is weird. Things change fast and I change fast […]
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1:27 AM | Macroscopic quantum teleportation: the story of my chair
In the summer of 2000, a miracle occurred: The National Science Foundation decided to fund a new Institute for Quantum Information at Caltech with a 5 million dollar award from their Information Technology Research program. I was to be the … Continue reading →
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1:00 AM | {3,3,7} Honeycomb Meets Plane at Infinity
The {3,3,7} honeycomb is a honeycomb in 3d hyperbolic space. It is the dual of the {7,3,3} honeycomb shown last time. This image, drawn by Roice Nelson, shows the 'boundary' of the {3,3,7} honeycomb: that is, the set of points on the 'plane at infinity' that are limits of points in the {3,3,7} honeycomb.
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12:23 AM | A Quick Update & Summer PD Links
Well hi!It's been a long summer, but quite a lot has happened in the meantime. Here's a run-down on the personal stuff that's been going on:I spent most of the summer working on creating PD sessions. (Links to follow below)I also worked for my county on a technology team and a curriculum team. Every other spare moment was spent quilting. *Sigh of bliss*My husband and I spent time converting the guest room into a sewing studio.I got a new job (EEEP!) on weekends teaching quilting […]
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12:00 AM | Re-sampling and Contemporary Inference: A tribute to Kesar Singh
Statistical Methodology, Volume 20, pages 1-126 (Sep-14) Edited by Soumendra Lahiri, Min-ge Xie
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12:00 AM | Special Issue on Combining Probability and Logic to Solve Philosophical Problems
Journal of Applied Logic, Volume 12, Issue 3, pages 233-376 (Sep-14) Edited by Niki Pfeifer
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12:00 AM | Turing Centenary Conference: How the World Computes
Annals of Pure and Applied Logic, Volume 165, Issue 9, pages 1353-1532 (Sep-14) Edited by S. Barry Cooper, Anuj Dawar, Martin Hyland, Benedikt Lowe
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12:00 AM | Special Issue on Matrix Functions
Linear Algebra and its Applications, Volume 456, pages 1-220 (Sep-14) Edited by Oliver G. Ernst, Chun-Hua Guo, Jorg Liesen, Leiba Rodman

August 31, 2014

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11:46 PM | Weekly Summary 8/31/14
This is it! Students come back on Wednesday!  Lots of thoughts and feelings happening right now.  Lets see if I can make a 3-2-1 summary of it.  If you would like to join in on the challenge, click here.3 things I found out this week that have me worried:1. Got a call from my father-in-law this week and my mother-in-law is not doing too well.  They found "stuff" on her lungs and pancreas, but since it is the holiday weekend they won't be able to do anything until Tuesday. […]
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11:26 PM | geometrymatters: Geometry Matters: Various nature elements that...
geometrymatters: Geometry Matters: Various nature elements that abide by geometric laws and construction patterns. © Geometrymatters,2014 Reblogged for the Visualizing Math followers that are fans of Sacred Geometry.
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11:13 PM | #MTBoSChallenge Week 3 Sunday Summary
This past week was our first week of classes!  We are an A/B schedule ... I saw each set of students twice.  Day 1 was a bit challenging because we had too much to accomplish but on Day 2 there was time for student discussion.  I loved the hum of math talk in the room!3 things that happened this past week ...On Day 2 I built in time for partners to discuss graphs, determining domain and range.  The hum of discussion, students helping students was exciting.  And then we […]
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11:00 PM | On This Day in Math - September 1
"Life is good for only two things, discovering mathematics and teaching mathematics"Siméon PoissonThe 244th day of the year; 244 is the smallest number (besides 2) that can be written as the sum of 2 squares or the sum of two 5th powers. *What's Special about this numberEVENTS1672 Hooke's diary records " Calculated lengths of Glasses." from Hooke's Journal *Robert Hooke ‏@HookesLondon This was done using Hookes "musical cylinder" or string phone. In July 1664 Hooke produced an experiment […]
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10:51 PM | A Rook Game
Problem: Two players take turns moving a rook on an 8×8 chessboard. The rook is only allowed to move south or west (but not both in a single turn), and may move any number of squares in the chosen direction on a turn. The loser is the player who first cannot move the rook. What is the optimal play […]
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10:42 PM | Pics of my Classroom #mtbos Challenge
I still have a ton of work to do tomorrow before the students come on Tuesday, but here it is so far…
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10:30 PM | Share from Repository (weekly)
Solve this math problem: The gender gap - LA TimesTags: no_tagPosted from Diigo. The rest of Read on the Web -- Repository group favorite links are here.
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10:14 PM | a day of travel
I had quite a special day today as I travelled through Birmingham, made a twenty minutes stop in Coventry to drop my bag, went down to London to collect a loaned city bike and took the train back to Coventry with the bike… On my way from Bristol to Warwick, I decided to spend the […]
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10:14 PM | efficient exploration of multi-modal posterior distributions
The title of this recent arXival had potential appeal, however the proposal ends up being rather straightforward and hence  anti-climactic! The paper by Hu, Hendry and Heng proposes to run a mixture of proposals centred at the various modes of  the target for an efficient exploration. This is a correct MCMC algorithm, granted!, but the […]
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8:23 PM | L'uomo che non sapeva dove morire
Due gli aspetti stuzzicanti che mi hanno spinto a leggere L'uomo che non sapeva dove morire dell'argentino Guillermo Saccomanno: l'ambientazione apocalittica descritta nel risvolto della prima di copertina ("In una città devastata dagli attacchi della guerriglia e dalle piogge acide, percorsa da bambini zombi e cani clonati") e il capitolo 38, una paginetta su cui mi si sono posati gli occhi casualmente: A volte, di nascosto, si porta una rivista in bagno. Seduto sulla tazza, legge un articolo […]
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8:14 PM | Girls’ Angle Bulletin, Volume 7, Number 6
The electronic version of the latest issue of the Girls’ Angle Bulletin is now available on our website. The cover illustrates a neat result that Anna B. discovered and explains in this issue’s Anna’s Math Journal. She continued her investigation of … Continue reading →
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7:45 PM | 利用重心推导平方和公式
假设平面上有 1 + 2 + 3 + … + n 个小球,每个小球的质量都是 1kg 。它们排成了一个三角形阵,具体地说,它们排成了一个倒置的、以 (0, 1) 为顶点的等边三角形。这个三角形阵作为一整个物体,它的重心的 y 坐标是多少?我们有两种不同的求解方法。 第一种方法是暴力方法。这个物体的重心的 y 坐标,一定等于所有小球的 y 坐标的平均值,即 (1 × 1 + 2 × 2 + 3 × 3 + … + n × […]
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