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Posts

July 06, 2015

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5:56 AM | Xenomoney
This photo and the next were taken at Place de la République in Paris on July 5 at about 11 PM. In Signifying Nothing:  The Semiotics of Zero, Brian Rotman writes of  “parallel patterns of semiotic disruption” to describe how the introduction of the sign for zero affected arithmetic, perspectival painting, and economic exchange.  “Zero […]
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5:56 AM | MathsLinks Feature: Share to Google Classroom
Many teachers are now using Google Classroom to connect with their students. Recently Google added the ability for external sites to share to your classroom. I have added this functionality to MathsLinks.
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5:00 AM | 2.18
- Figures sans paroles / Les figures sans paroles
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5:00 AM | Di altalene, molle e vasche da bagno — attriti
“Vasche da bagno?”.“E altalene, e molle”.“E cosa c'entrano con la matematica?”.“A parte il fatto che, volendo, tutto c'entra con la matematica, in questo caso parliamo di un fenomeno preciso: le oscillazioni”.“Quindi parliamo di fisica”.“Eh, dipende dal punto di vista: la matematica fa da modello per i fenomeni fisici, oppure è l'alfabeto nel quale Dio ha fcritto l'univerfo?”.“…”.“Ma non addentriamoci in queste questioni filosofiche”.“Ecco, […]
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5:00 AM | Near-Optimal Estimation of Simultaneously Sparse and Low-Rank Matrices from Nested Linear Measurements
   Both figures are from Simultaneously Structured Models with Application to Sparse and Low-rank Matrices by Samet Oymak, Amin Jalali, Maryam Fazel, Yonina C. Eldar, Babak Hassibi. Back a while ago, it was mentioned that the use of Multiple regularizers may not yield a good enough way to reduce sampling bounds while at the same time enforcing different prior information on the structure of the signal - see the video Convex Relaxations for Recovering […]
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4:00 AM | Relations & Their Relatives : 14
Re: Peirce List Discussion • Helmut Raulien Cf: Relation Reduction : Examples of Projectively Reducible Relations I constructed the “Ann and Bob” examples of sign relations back when I was enrolled in a Systems Engineering program and had to explain … Continue reading →
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3:48 AM | Graphic Organizer: Solving Simple Equations
Reviewing some old papers and I found the following Graphic Organizer. Those were big that year, after they were stressed in a PD. I tried to make things a little more visual, even if it was only a flowchart with boxes and lines. Better than fill-in-the-blank problems, right? Oddly enough, my initial thought for this sheet was to NOT have the students place the solutions in the final column. I felt that the actual solution was secondary to getting the solution. Or should I say "knowing how to […]
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3:23 AM | Theses
Many Ph.D. programs have an arrangement with ProQuest whereby a copy of each dissertation (or Ph.D. thesis) is deposited with ProQuest and made available for ordering.  One way to find them is by going to the ProQuest website.  Another is to … Continue reading →
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3:16 AM | Open House: Week 1, Day 2
Last week was the first week of a four-week summer academy. I teach a 110-minute class, four days a week, and it's designed as an enrichment course: no homework, no tests, no grades. The class is titled Get Ready for Algebra and here's the working schedule for the four weeks.It's a great opportunity for me to practice some of my skills; skills I once possessed and skills I learned this past year, but didn't practice enough. Initially I thought I'd be keeping some of my skills sharp, but I […]
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3:14 AM | Indistinguishability Obfuscation and Multi-linear Maps: A Brave New World – Guest Post by Ran Canetti
A bunch of us hapless cryptographers got the following boilerplate comment from the FOCS’15 PC: “Overall, submissions related to multi-linear maps and indistinguishability obfuscation were held to a somewhat higher standard. The PC expressed some concern with the recent flurry of activities pertaining to multi-linear maps and indistinguishability obfuscation, given how little we understand and […]
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2:55 AM | Innumeracy and Sharks
Here’s a brief snippet from a conversation about the recent spate of shark attacks in North Carolina as I heard yesterday morning (approx 6AM, 7/4/15) on CNN. George Burgess (Director, Florida Program for Shark Research):  “One thing is going to happen … Continue reading →
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2:15 AM | Modeling Instruction in Physics: Summary of Unit 1
Unit 1 is the unit to set up everything that's going to be coming after it. It's the time to focus on good lab habits and the procedures for how the class will be run. These will come up in later units, but now is the time to be explicit about expectations.Here are the content objectives for the unit (from the Teacher Notes):Experimental designBuild a qualitative modelIdentify and classify variablesMake tentative qualitative predictions about the relationship between variablesData […]
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2:02 AM | Do You Let Yourself Fail?
Originally posted on Number Loving Beagle:I sat down this weekend to do some recreational mathematics with a friend.  Maybe you know him; his name is Justin Aion.  He writes a pretty cool blog over at Re-Learning to Teach. I made it a goal of mine this year to work on some geometry for a…
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2:01 AM | hyrodium: The reason why Involute gears turn smoothly. Fig 1)...
hyrodium: The reason why Involute gears turn smoothly. Fig 1) How to draw involute of circle.Fig 2&3) Move and rotate the observing point.Fig 4&5) The curves are tangent.Fig 6)  Involute gears turn smoothly.
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1:39 AM | May the Fourth be with you…….
For the past two winter studies I’ve taught a course on the Mathematics of LEGO bricks, with a goal of assembling a team to assemble the 3152 piece Superstar destroyer  in under 10 minutes (we just missed by a few seconds the first year, and did it in under 9 in the second). This left
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1:29 AM | Does Bob Deserve the lavish acknowledgement: A problem in Logic
Alice and Carol are real mathematicians. Bob is an English major who does not know any mathematics. (This story is based on a true incident.) Alice writes a math paper. Carol reads it and offers corrections of style and grammar and how-to-say-things. She also helps simplify some of the proofs. She does not deserve a co-authorship but Alice does of course write in the acknowledgements I would like to thank Carol for proofreading and for help with some of the proofs. Bob points out that […]
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12:08 AM | Baby steps
Today was rough…at least it was in the morning. Blowing $%&( up late into the night (but not as late as the majority of the neighborhood) makes for rough mornings. But it is July, and I don’t really have much need at this point to even know what day it is. But two days ago, I […]
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12:00 AM | othergeeks: In the academic world Dover Publications is widely...
othergeeks: In the academic world Dover Publications is widely known for publishing standard texts in mathematics. To me they’re known for publishing books with the best cover designs around, which truly make them stand out among the boring rest.

July 05, 2015

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11:54 PM | 1st Week of PCMI
I am participating in a summer school on “Geometry of moduli spaces and representation theory”, which is organized by PCMI – Park City Math Institute. Moreover, all the participants stay at Zermatt Resort where we also have our lectures and tutorials.  So here are some daily summaries, enjoy ^_^ 1st day (Sunday 28th June): travelling… Incredibly long […]
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11:00 PM | On This Day in Math - July 6
You, who wish to study great and wonderful things, who wonder about the movement of the stars, must read these theorems about triangles. Knowing these ideas will open the door to all of astronomyand to certain geometric problems.Johann Regiomontanus De Tringulis Omnimodis The 187th day of the year; 187^(1*8*7)+1+8+7 is prime. There are only two such (non-zero) numbers. Students might search for the other.The 187th prime is 1117. 11*17 = 187 & 187² and 187³ don't […]
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10:31 PM | Share from Repository (weekly)
The Source of Bad Writing - WSJTags: no_tagStudent Data Could Pose Privacy RiskTags: no_tagWhat’s So Fun About Fake Data? - The Daily BeastTags: no_tagMetaphor map charts the images that structure our thinking | Books | The GuardianTags: no_tagExample gallery — seaborn 0.6.0 documentationTags: no_tagCan an Algorithm Hire Better Than a Human? - The New York TimesTags: no_tagEvolution of the Function Concept -- A brief surveyTags: no_tagYou Draw It: How Family Income Predicts Children’s […]
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10:25 PM | The inner artificial life of a cell, a game proposal
The  inner life of a cell is an excellent, but passive window It is also scripted according to usual human expectations: synchronous moves, orchestrated reactions at a large scale. This is of course either something emergent in real life, or totally unrealistic. As you know, I propose to use the artificial chemistry chemlambda for making … Continue reading The inner artificial life of a cell, a game proposal →
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10:15 PM | efficient approximate Bayesian inference for models with intractable likleihood
Dalhin, Villani [Mattias, not Cédric] and Schön arXived a paper this week with the above title. The type of intractable likelihood they consider is a non-linear state-space (HMM) model and the SMC-ABC they propose is based on an optimised Laplace approximation. That is, replacing the posterior distribution on the parameter θ with a normal distribution […]
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9:48 PM | Status Update
Due to medical and personal issues in my orbit, I will be less than visible for next 2 months. FYI. 
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9:45 PM | EPFL IC Research Day
EPFL (Lausanne, Switzerland) School of Computer and Communication Sciences did a Research Day celebration on June 30, 2015.Typically these research days tend to focus on big tangibles, maybe Big Data (research day in 2014), Drones, Brains, Digital Humanities or something of that ilk. What or who would instigate the Audacity of Theoretical Computer Science? Philippe Gillet  (wish I had more time to talk to him, his research on extraterrestial matter as well as formation of Alps seems […]
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9:31 PM | Escher und Leys
Bilder von Jos Leys hatten wir hier im Blog schon oft verwendet, vor allem in der “Topologie von Flächen”-Reihe (z.B. die Faserung des Komplements der Kleeblattschlinge oder die Verschlingungen im Lorenz-Attraktor oder den Anosov-Fluss). Und auch die Filme Dimensions und Chaos hatten wir hier besprochen. Am Dienstag hörte ich einen Vortrag von Leys auf einer…
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9:16 PM | PCMI: Week One
I have just finished (survived?) the first of my three weeks at the Park City Math Institute. The research topic this year is “Geometry of Moduli Spaces and Representation Theory.”  For those of you not in the know, PCMI is … Continue reading →
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8:29 PM | Advertising images for HSBC Commercial Banking
Advertising images for HSBC Commercial Banking   by Jing Zhang   http://im-possible.info/english/art/advertising/hsbc.html   Author - http://www.mazakii.com/
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8:09 PM | Everyone Got This SAT Math Question Wrong. Can You Solve It? Sunday Puzzle
This math question appeared on the 1982 SAT Examination. Circle A has 1/3 the radius of circle B. Circle A rolls around circle B until it returns to its starting position. How many revolutions of circle A are there in total? (a) 3/2 (b) 3 (c) 6 (d) 9/2 (e) 9 What’s the correct answer? … Continue reading Everyone Got This SAT Math Question Wrong. Can You Solve It? Sunday Puzzle
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8:00 PM | Stat of the Week Competition: July 4 – 10 2015
Each week, we would like to invite readers of Stats Chat to submit nominations for our Stat of the Week competition and be in with the chance to win an iTunes voucher. Here’s how it works: Anyone may add a comment on this post to nominate their Stat of the Week candidate before midday Friday […]
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