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Posts

September 22, 2014

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8:38 PM | My Presentation At #NJPAECET2
On September 20th, 2014, I gave a talk at NJPAECET2 at Raritan Valley Community College. Let me just say that Barry Saide and his team did one heck of a job organizing the conference. We were fed, provided a hotel room, and most important of all, the quality of the individuals present was outstanding. I […]
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8:14 PM | Class Opener – Day 15 – Paint it Black
Students arrived in class today to find tic-tac-toe boards on their desks, and a challenge on the board: A 3×3 square is partitioned into 9 unit squares.  Each unit square is painted either white or black with each color being … Continue reading →
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8:11 PM | Speaking Truth to Parallelism: The Book
A few months ago, I signed a contract with MIT Press to publish a new book: an edited anthology of selected posts from this blog, along with all-new updates and commentary.  The book’s tentative title (open to better suggestions) is Speaking Truth to Parallelism: Dispatches from the Frontier of Quantum Computing Theory.  The new book should […]
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7:52 PM | Comparing Ratios: What Feedback Would You Give?
  What feedback would you give to this student? Some considerations… Would you ask a question or make a statement? What written feedback would be most helpful? If you were able to have a conversation with this student, how would you start it? What would the student’s job be once you handed the paper back… Continue reading →
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7:52 PM | Math Reflection 180: Day 16
Talking Points Which talking point statement is most important about talking?  Explain. Which statement did you change your mind about?  Explain. What was the most important element of the “talk procedure”?  Explain.Filed under: Math Reflection 180 Tagged: Math Reflection 180, talking points
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7:22 PM | Epistricted Trits
In quantum mechanics, we are always calculating probabilities. We get results like, “There is a 50% chance this radioactive nucleus will decay in the next hour.” Or, “We can be 30% confident that the detector at position X will register a photon.” But the nature and origin of quantum probabilities remains obscure. Could it be […]
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7:14 PM | What's the most likely age to die?
It’s all very well telling someone their life expectancy but this does not communicate the variability around that central value. But the life tables published by the Office for National Statistics (ONS) have a convenient column labeled $d_x$ - this is the probability density for survival, expressed as the expected number of deaths at each age out of 10,000 births, assuming the current mortality rates continue.
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7:06 PM | Castle on the Cliff
Castle on the Cliff   by Vlad Alexeev   http://im-possible.info/english/art/computer/vlad.html#castle-on-the-cliff
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6:49 PM | Special Blog Carnival Edition of 1001 Math Problems !
Welcome to the 78th edition of the Math Teachers At Play math education blog carnival, which I am thrilled to be hosting this month in celebration of my soon-to-be-released book, Camp Logic.  What is the blog carnival?  It is a monthly snapshot of some interesting recent ideas and activities posted by math education bloggers all over the internet.For more information about the MTaP blog carnival, including previous editions, click here.By tradition, I begin with a fun fact […]
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6:13 PM | New images by Vicente Meavilla
New images for children by Vicente Meavilla  http://im-possible.info/english/art/vicente/for-children-11.html#dino4
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6:06 PM | Fall is here: Welcome new RSRGers
While other universities have been back in session for a while now, we’re just getting started here at Caltech.  Today begins our orientation week, and so we have lots of new grads and postdocs showing up these days! So, I wanted to use this post to give an official welcome to the new RSRG students […]
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5:51 PM | Goodbye MSR-SVC
This week I'm back at Dagstuhl for the Workshop on Algebra in Complexity Theory. Bill is here as well and we hope to have a typecast for you later this week. The big discussion is the closing of Microsoft Research in Silicon Valley last week. The 50 researchers at MSR-SVC included 15 in a strong theory group. Luckily I captured the page last night as Microsoft has eliminated all mention of the lab from its web site. Just like the novel 1984: Microsoft doesn't have a research lab in Silicon […]
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5:33 PM | John Oliver rips apart the insane math of the Miss America contest
John Oliver rips apart the insane math of the Miss America contest: Dylan Matthews: The math used by the pageants to generate higher scholarship figures is pretty astounding. Pennsylvania’s pageant counted the cash value of four schools’ scholarships offered to the winner, despite the fact that she obviously couldn’t take all four. Alabama’s claimed to offer $2,592,000 in scholarships to Troy University, which they got by multiplying the $54,000 value of the scholarship by 48, the […]
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5:31 PM | Mother's thyroid level 'may predict child's poor maths'
Mother's thyroid level 'may predict child's poor maths': BBC News: Dutch researchers tracked 1,196 healthy children from birth to age five, having recorded their mothers’ thyroxine levels at 12 weeks of pregnancy. They then looked at the children’s test scores for language and arithmetic. [source: mme rss]
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5:03 PM | 20 things every teacher should do
The objective of this list is to identify a core set of teacher practices that every teacher should do. There are some things missing from my list. For example, I have not highlighted the need for every teacher to be aware of issues around the social status of their students, their students emotional needs, or have a certain level of cultural awareness. I think these things are important, but I'm not sure how to describe them in a sentence. If you have any suggestions... I'm also fully aware […]
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4:34 PM | Open Evening
Open Evening season is underway. In this post I want to share a few ideas for activities that a Maths Department can run. Before I do so, it's helpful to think about the purpose of Open Evenings. According to the Good Schools Guide, this is why a parent should attend an Open Evening: "They may not truly reflect day to day life at a school (this will be school at its best) but they'll give
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4:28 PM | CGI is for High School Teachers
There's a new edition of Children's Mathematics coming out soon, and I got my paws on an advance copy of the book. I like the people at Heinemann (the publisher) and I like the book so I said I'd write a few words about this new edition, and the book more generally.---Here's my story: I'm a high school teacher that got a job at a school where the high school teachers also teach little kids. Last year I taught 4th, 5th, 9th and 11th graders. This year it's 3rd, 4th, 5th and 9th. I love it.I came […]
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4:06 PM | junge Lehrer vs. alte Lehrer
Gilt ja eigentlich nicht nur in der Schule, aber da fällt es mir besonders auf. [Schule im Schaubild]
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4:05 PM | Group velocity of electromagnetic waves in a dispersive medium
References: Griffiths, David J. (2007), Introduction to Electrodynamics, 3rd Edition; Pearson Education – Problem 9.25. In a dispersive medium, the permittivity is a complex quantity given by and the wave vector is also complex: If the sum term in 1 is small compared to , we can approximate it in the square root using . […]
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4:00 PM | Riemann zeta functions and linear operators
A conjectural approaches to the Riemann hypothesis is to find a correspondence between the zeroes of the zeta function and the eigenvalues of a linear operator. This was first conceived by Hilbert and by Pólya in the 1910s. (See this correspondence with Odlyzko.) In the subsequent century, there have been a number of rigorous results […]
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4:00 PM | Dynamic Visualizatin of Markov Chains
Here is a visual demonstration of Markov Chains by Victor Powell. We've seen his work before in demonstrating conditional probability. These dynamic views of one, two, and then many state Markov Chains.The program allows for varying transition probabilities, varying speed of travel between the states, and a realization of the resulting time series of state visits. Another very nice visualization.
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3:55 PM | Evolution of movies
We know that movies have changed over the decades. We've seen it in declining ratings and box office hits versus …Tags: movies, Wired
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3:46 PM | The existence proof for Hopf bifurcations
In a Hopf bifurcation a pair of complex conjugate eigenvalues of the linearization of a dynamical system at a stationary point pass through the imaginary axis. This has been discussed in a previous post. Often textbook results (e.g. Theorem 3.3 in Kuznetsov’s book) concentrate on the generic case where two additional conditions are satisfied. One […]
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3:33 PM | Some will spam you with a six-gun and some with a fountain pen
A few weeks ago the following came in the email: Dear Professor Gelman, I am writing you because I am a prospective doctoral student with considerable interest in your research. My name is Xian Zhao, but you can call me by my English name Alex, a student from China. My plan is to apply to […] The post Some will spam you with a six-gun and some with a fountain pen appeared first on Statistical Modeling, Causal Inference, and Social Science.
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3:30 PM | Solvent paper dissolves under heat of institutional investigation
A chemical engineering paper published in February has been retracted for data and authorship problems. According to the retraction notice, the authors’ institutions investigated and found that not only was the data not reproducible, but “not all co-authors on the manuscript were aware of or agreed to the content and scientific conclusions in the article.” […]
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3:30 PM | Book / Proceedings / Lecture Notes: Statistical physics, Optimization, Inference and Message-Passing algorithms
Last year, there was a "Ecole de Physique" in Cargese on Statistical physics, Optimization, Inference and Message-Passing algorithms. Florent Krzakala, one of the organizers, mentioned earlier today that they had released the lecture notes of the talks. They are all on this page.  Autumn School, September 30 -- October 11, 2013HomeOverviewProgram/PhotosParticipantsBookProceeding of all lecturesCalled "Statistical Physics, Optimization, Inference, and Message-Passing Algorithms" and […]
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3:00 PM | Ripples from dawn of creation vanish in a puff of dust
We thought the BICEP2 telescope had seen gravitational waves from the universe's creation, but the Planck spacecraft suggests cosmic dust was the source
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2:35 PM | Secondary Math Instruction & Assessment in Light of the Common Core: The Math Assessment Project
Professional Learning Series starts soon at Kalamazoo RESA Dates & Times: 10/1/2014 7:30AM-2:30PM 11/5/2014 7:30AM-2:30PM 12/3/2014 7:30AM-2:30PM 1/23/2015 7:30AM-2:30PMLocation: Kalamazoo RESA Service Center, 1819 East Milham Avenue, Portage, MI 49002SCECH'S: 18 .. $15 fee is due at sign-in (cash or personal check only)Presenter(s): Diane Rogers Tuition: $365 Consortium Member | $503 Non Consortium Secondary Math Instruction & Assessment in Light of […]
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2:03 PM | Where is that spacecraft?
Philadelphia, PA—Space surveillance is inherently challenging when compared to other tracking environments due to various reasons, not least of which is the long time gap between surveillance updates. “Unlike the air and missile defense environments where objects are frequently observed, the space surveillance environment data is starved, with many objects going several orbital periods between [...]
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1:44 PM | How Income Compares to Spending: 1993 vs. 2013
Over the past 20 years the average spending of many groups of Americans has increased more than their income. The gap is especially poignant for those under 25 years old.
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