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Posts

January 25, 2015

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7:49 PM | Being smart, being judged smart
There’s recently been a lot of fuss (including on some philosophy blogs) about a short paper by Sarah-Jane Leslie et al., that purports to show that  “women are under-represented in fields whose practitioners believe that raw, innate talent is the main … Continue reading →
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7:18 PM | A Band Of Sanity
A Band Of Sanity  by Erwin Bonsma   http://im-possible.info/english/anim/gif/erwin-bonsma-2.html   Author - http://eriban.deviantart.com/
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7:11 PM | Electric quadrupole radiation
References: Griffiths, David J. (2007), Introduction to Electrodynamics, 3rd Edition; Pearson Education – Chapter 11, Post 11. In analyzing radiation from an arbitrary configuration of charge, we made the assumption that the maximum dimension of the source is much smaller than the observation distance, so that we can retain only first order terms in , […]
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6:01 PM | definition of real numbers proof
newest proof
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5:48 PM | Diamonds are forever…
:)
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5:38 PM | Radiation from a charge falling under gravity
References: Griffiths, David J. (2007), Introduction to Electrodynamics, 3rd Edition; Pearson Education – Chapter 11, Post 10. If a charge falls under the influence of gravity, it accelerates and therefore radiates. This means that not all of the potential energy lost as the charge falls is converted to kinetic energy, so a charged object falls […]
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5:38 PM | Assistant Professor, Mathematical Sciences (University of Montana)
Assistant Professor, Mathematical Sciences (University of Montana): Here is the Job Description: The University of Montana invites applications for an Assistant Professor, tenure-track position in Mathematics Education to begin August 2015. UM, the College of Humanities and Sciences, and the Department embrace diversity as a core value. Applications from persons with diverse backgrounds are especially welcome. UM, the College of Humanities and Sciences, and the Department embrace diversity as a […]
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5:37 PM | Dreaming about Maths
I've only been back at work three weeks and I've already started to dream about maths again. And not in a good way. I mark a set of homeworks and dream about the answers - they swim around my head all night long, tormenting me. Perhaps I shouldn't mark in the evenings. I also lie awake at night thinking about lessons that didn't go well. I know, I know - don't dwell on them - after all, I learn
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5:34 PM | NHL, Sportvision attempt revolutionary new method of data collection
NHL, Sportvision attempt revolutionary new method of data collection: TSN.ca Staff: The NHL and Sportvision announced on Saturday a partnership to revolutionize the collection of data in the game of hockey.
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5:31 PM | Thinking About Complex Numbers Geometrically
There are two different ways to think about complex numbers -- algebraically or geometrically. Most math students only learn how to think algebraically about complex numbers. This is a shame. It’s like playing piano with one hand tied behind your back. Without the geometric perspective, many complex numbers problems become harder.(I also think that without the geometric perspective complex numbers hardly make any sense at all.)Here's a fairly typical complex numbers problem (from a PARCC […]
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5:01 PM | Reflections on Paul Erdős on His Birth Centenary
Reflections on Paul Erdős on His Birth Centenary: Part 1 of a two-part feature on Paul Erdős in the Notices of the American Mathematical Society.
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5:00 PM | Power radiated by a spinning ring of charge
References: Griffiths, David J. (2007), Introduction to Electrodynamics, 3rd Edition; Pearson Education – Chapter 11, Post 9. Here’s a generalization of the rotating dipole problem we did earlier. This time we have a circular ring with radius with a linear charge distribution, at , of where is the azimuthal angle. The disk is set spinning […]
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4:46 PM | Volume, Scaling, and a surprising relationship to the Fibonacci numbers.
We used our Zome Geometry book for another Family Math project today. The project we stumbled on used the blue struts to talk about volume and scaling. It starts by asking a seemingly simple question about the volume of two boxes you can make with the blue struts. Here’s the problem:   and the constructed…
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4:42 PM | OBE
No, it is not the Queen’s Honours list. It stands for Outcomes Based Education, the latest pedagogical fad. The EU has practically adopted it as its official educational project. Which probably means that to bid successfully for EU funded projects … Continue reading →
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4:29 PM | Electric dipole radiation from an arbitrary source
References: Griffiths, David J. (2007), Introduction to Electrodynamics, 3rd Edition; Pearson Education – Chapter 11, Post 8. Having examined electromagnetic radiation from an oscillating electric dipole, we can now look at radiation from an arbitrary source of moving charges. The derivation of the results is rather long and Griffiths treats it in detail in his […]
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3:27 PM | Democrat plus Republican over the square-root of two
I wish I could superpose votes on Election Day. However much I agree with Candidate A about social issues, I dislike her running mate. I lean toward Candidate B’s economic plans and C’s science-funding record, but nobody’s foreign policy impresses … Continue reading →
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2:33 PM | This Week's Puzzle
No summary available for this post.
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2:19 PM | Tell me what you don’t know
We’ll ask an expert, or even a student, to “tell me what you know” about some topic. But now I’m thinking it makes more sense to ask people to tell us what they don’t know. Why? Consider your understanding of a particular topic to be divided into three parts: 1. What you know. 2. What […] The post Tell me what you don’t know appeared first on Statistical Modeling, Causal Inference, and Social Science.
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1:36 PM | Tangrams
A presentation introducing Tangrams, followed by the rather essential tangram-set and finally, a bunch of printable sets of tangram puzzles tangram-images-variations tangram-people  
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1:30 PM | 1/25/15
1 * √25 = 1 * 5 Also: |1 - 2 - 5 + 1| = 5
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1:18 PM | icicles on the Ben
Filed under: Mountains, pictures, Travel Tagged: Ben Nevis, Highlands, ice climbing, Scotland
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1:07 PM | Rob's 60th
Rob Calderbank is a mathematician of great caliber in coding and information theory, including its algebraic aspects. He is the winner of the Shannon award and the Hamming medal. Rob's 60th birthday celebration will be in La Jolla this weekend. He was a terrific mentor to me at AT&T in years long behind us, and I am looking forward to being at the celebration!
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12:59 PM | absolute value defines a distance of real numbers
updated corollary
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12:38 PM | Tests, Quizzes and Grades
One of the changes I made this year is I stopped giving end of unit/chapter tests.  Our school is using Achievement Network to administer benchmark exams every 6 weeks and we have arranged our curriculum so that we are teaching those standards that they will be tested on.  So I thought, these are actually the unit tests, there is no need for two.What I do give are frequent concept checks.  These are quizzes and I've made them worth 60% of the students grade and I hoped that by […]
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12:18 PM | 5 Math Jokes About Engineer, Physicist, Mathematician
Office Fire An engineer, a physicist, and a mathematician are working, when a small fire breaks out in front of their offices. The engineer panics and grabs the fire extinguisher, spraying it everywhere, putting out the fire, but causing extra damage in the process. The physicist runs some quick calculations, and uses just enough to […] Math and Multimedia - School math, multimedia, and technology tutorials.
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12:15 PM | James Gleick On Mathematics
This week's 'Sunday reflection,' a few succinct lines from an old NY Times James Gleick piece:"…unspoken, but always present, is the faith that doing mathematics purely, following an internal compass, seeking elegance and beauty in a strange abstract world, is the best way in  the long run to serve practical science. As physics or biology progress, they will inevitably find that the way ahead has been cleared by some odd piece of pure mathematics that was thought dead and buried for many […]
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11:58 AM | Solution to 2014 MMC Division Finals-Orals 4th Year
This blog post will outline the solution to last year’s MMC division finals-orals team category. We will start for the first ten questions, the next set of questions will be added very soon. 15-second... The post Solution to 2014 MMC Division Finals-Orals 4th Year appeared first on Techie Math Teacher.
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11:39 AM | Lovely or Tricky Triangle Question?
In addition to not being drawn to scale and asking for congruence anyway, I like this problem because it potentially forces some great class discussions. One responder suggested using the Law of Sines (LoS) to establish an isosceles triangle.  My first … Continue reading →
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11:22 AM | Un anno di matematica e Pink Floyd
Ieri il mio librino La matematica dei Pink Floyd ha compiuto un anno, dato che è uscito ufficialmente il 24 gennaio 2014.Sono stati dodici mesi entusiasmanti: ho avuto l'onore di presentare l'e-book al Salone Internazionale del Libro di Torino ma anche in altre occasioni non meno divertenti, presso biblioteche e scuole e all'interno di trasmissioni radiofoniche.Il destino ha anche voluto far sì che l'anno del mio librino coincidesse con l'anno del ritorno dei Pink Floyd, con il nuovo album […]
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11:07 AM | Marking
Currently marking exam scripts. Do students read the comments on what went wrong for students last year? If so, when they read “many students incorrectly wrote <this>”, perhaps what they remember is <this>. For example, every year that I ask for … Continue reading →
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