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Posts

April 24, 2014

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9:52 AM | Where People Bike and Run, Worldwide
Remember those running maps I made with limited data from RunKeeper? Strava, which also provides an app to track your …
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9:40 AM | Elsevier journals — some facts
A little over two years ago, the Cost of Knowledge boycott of Elsevier journals began. Initially, it seemed to be highly successful, with the number of signatories rapidly reaching 10,000 and including some very high-profile researchers, and Elsevier making a number of concessions, such as dropping support for the Research Works Act and making papers […]
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9:30 AM | The #1 Thing I Won't Teach Next Year: Integer Operations
I realize it's still April.  Our last day of school is May 14th.  But, I'm already thinking about next year.  In fact, I'm thinking a lot about next year.  Things I want to do.  Things I don't want to do.  Things I need to do.  Things I should think about doing. Here's the deal.  Oklahoma is changing standards next year.  Originally, we were a PARCC state.  Next year is supposed to be our first year of full implementation of Common Core. […]
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7:55 AM | Navigare con la matematica – Maddmaths!
Navigare con la matematica leggi articolo completo
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7:29 AM | Announcement: TikZ workshop
I should’ve made this announcement sooner, but today I am giving an introductory workshop to TikZ (and friends). It is organised by my friends of PRIME and takes place today (Thursday, April 24) at 17h30 in room Turing, of building S9 on the Sterre campus of Ghent University. Everyone can attend, but it will be […]
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6:29 AM | Still learning - Diagrams and conceptual understanding
No summary available for this post.
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6:00 AM | 5535
5535 = 3 x 3 x 3 x 5 x 41.Every digit of 5535 is a prime factor of 5535 (A062239).5535 and the square of 5535 use only the digits 0, 2, 3, 5, and 6 (A136888).5535 is a number n such that n3 - 4 and n3 + 4 are prime (A161589).5535 is a number n such that (n3 + 2 and n3 + 4) is a twin prime pair (A178337).5535 divides 7312 - 1.5535 is a number that cannot be written as a sum of three squares.Source: OEIS
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5:58 AM | Anche le scimmie sanno la matematica, e contano (almeno) da 0 a 25 – Greenreport
Anche le scimmie sanno la matematica leggi articolo completo
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5:41 AM | Publishing an R package in the Journal of Statistical Software
I’ve been an editor of JSS for the last few years, and as a result I tend to get email from people asking me about publishing papers describing R packages in JSS. So for all those wondering, here are some general comments. JSS prefers to publish papers about packages where the package is on CRAN and has been there long enough to have matured (i.e., obvious bugs ironed out and a few active users). This is partly because we have so many submissions that it helps to filter some out and this […]
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5:33 AM | IXL Maths: matematica pratica dalla scuola dell’infanzia alla secondaria di II grado
Risorse di matematica dalle scuole elementari fino alle scuole superiori leggi articolo completo
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5:32 AM | NASA Space Crews
In the Apollo missions many of the crew were experienced, but some were not. So I drew a diagram - see what patterns you see.
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5:32 AM | Software Checklist
During the second World War, fighter pilots would scramble to take off. Their heart would stop when the engine mis-fired. Was the fuel mix too rich, or too lean? Turn the control wrong way and they could die ...
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5:28 AM | Equazione di II grado parametrica | Prof. Alberti
Equazione parametrica di secondo grado vedi video
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5:26 AM | Invariant subspaces and Deddens algebras
My paper entitled `Invariant subspaces and Deddens algebras’ has been accepted for publication in Expositiones Mathematicae. Here is the abstract It is shown that if the Deddens algebra associated with a quasinilpotent operator on a complex Banach space is closed … Sigue leyendo →
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5:25 AM | Sistemi simmetrici | Prof. Alberti
Sistemi simmetrici vedi video
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5:00 AM | Blind Image Deblurring by Spectral Properties of Convolution Operators - implementation -
Here is a somewhat 'older' blind deconvolution algorithm (compared to this one)Blind Image Deblurring by Spectral Properties of Convolution Operators by Guangcan Liu, Yi MaIn this paper, we study the problem of recovering a sharp version of a given blurry image when the blur kernel is unknown. Previous methods often introduce an image-independent regularizer (such as Gaussian or sparse priors) on the desired blur kernel. For the first time, this paper shows that the blurry image […]
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4:00 AM | Peirce’s 1870 “Logic Of Relatives” • Comment 10.10
The last of the three examples involving the composition of triadic relatives with dyadic relatives is shown again in Figure 25. (25) The hypergraph picture of the abstract composition is given in Figure 26. (26) This example illustrates the way that Peirce … Continue reading →
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3:59 AM | [NCTMNOLA Processing Session 5] Networks and Silos
This will be the fifth and final NCTMNOLA Processing Session. It’ll be short too, just a quick debrief. I vacillate between the poles of “math is different” and “math is just like other subjects.” Sometimes I wonder if math teachers … Continue reading →
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3:25 AM | [NCTMNOLA Processing Session 4] I may have missed my calling
Those most mathematical fun I had at NCTMNOLA was in sessions focused on Elementary School level math. Either by accident or by impulse I found myself drifting into sessions that one would associate with K-5. Well, if that’s the case, … Continue reading →
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1:57 AM | The Math of Rock Climbing
What's it like to fall 40 feet down a sheer cliff face, while dangling from a rope hundreds of feet from the ground? Emory mathematician Skip Garibaldi describes his rock climbing experiences on El Capitan in Yosemite National Park. He also explains some basic climbing math, such as the fall factor, used to reduce the risk of injury during a rope climb.
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1:55 AM | [NCTMNOLA Processing Session 3] Summer School is Dead, Long Live Summer School
In between the instant they opened the door to Jo Boaler’s talk on “Promoting Equity Through Teaching for a Growth Mindset” and when she began speaking, I, Eleanor, and a few others in my row banded together as Jo Boaler … Continue reading →
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1:44 AM | American Pi
No summary available for this post.
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1:42 AM | ITU 100 GHz Frequency Grid Math
Introduction A physicist in my group and I were having a discussion about how the wavelengths (i.e. colors) for lasers are specified by an international standard and I thought this discussion would provide a nice example of a differential approximation. … Continue reading →
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1:08 AM | backwardinduction: In mathematics, an algebraic set is the set...
backwardinduction: In mathematics, an algebraic set is the set of solutions of a system of polynomial equations. Algebraic sets are sometimes also called algebraic varieties, but normally an algebraic variety is an irreducible algebraic set, i.e. one which is not the union of two other algebraic sets. Algebraic sets and algebraic varieties are the central objects of study in algebraic geometry. The word “variety” is employed in the sense which is similar to that of manifold; […]
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1:01 AM | Believe it or not, we've been talking about the nice Krugman -- some perspective on the 538 debate
[You may have trouble getting past the NYT firewall on these. If so, the easiest way around this is either to Google name and author or do what I did and go here for a complete set.]One of the side questions in the ongoing 538 debate is whether or not Nate Silver and his writers are being excessively criticized. There is certainly some truth to the charge (for reasons I'll get into later), but it's also important to remember that, to a remarkable extent, Silver walked into a bar fight, a number […]
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12:09 AM | Lecturer in Pure Mathematics
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April 23, 2014

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11:44 PM | Manitoba Education Minister takes a swipe at Alberta’s “not as successful” math curriclum
Manitoba Education Minister takes a swipe at Alberta’s “not as successful” math curriclum: David Staples: In response to concerns from parents and experts, such as University of Manitoba math professor Robert Craigen and University of Winnipeg math professor Anna Stokke, the Manitoba brought in a number of chances. "the Manitoba brought in a number of chances"!? [source: mme rss]
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11:30 PM | On This Day in Math - April 24
Simplicibus itaque verbis gaudet Mathematica Veritas, cum etiam per se simplex sit Veritatis oratio.(So Mathematical Truth prefers simple wordssince the language of Truth is itself simple.)~ Tycho BraheThe 114th day of the year; the sum of the first 114 digits of e after the decimal point, is prime. This is the third consecutive day number with this property. And From Mario Livio: The number of ways of coloring the faces of a cube with 3 different colors is 114.EVENTS1066 Halley's Comet […]
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11:04 PM | A Hastily Composed Rant Against Fancy-Pants Colleges
Apparently, adults are still telling children who will definitely be going to go to college that they should try to get into the best college possible. Moreover, apparently we teachers are actively encouraging our high-flying students to get into the highest-ranked college possible.Here's my argument that this is an awful thing and that we should stop.You'll learn more at the top-notch universities.Let's start with the observation that universities don't typically do anything interesting, […]
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10:56 PM | More on the Fermi paradox (from David Wallace).
In a comment to the previous post on the Fermi Paradox, David Wallace wrote this terrific exposition of it. I agree with almost everything he says, so I will save my own quibbles for a comment. David writes: Just to clarify the force of the Fermi paradox (which is intended...
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