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Posts

September 18, 2014

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9:35 AM | Data manipulation in GAMS, R or SQL
When moving data from GAMS to R via SQLite we have three possible spots where we can apply some data manipulation: Suppose we want to plot some data but need to do: Here is the code in GAMS: I could do the same thing in R, but the code is somewhat messy, not in the least by the type conversions:   The final attempt is in SQL, which is not too bad either:
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9:30 AM | The University of Nottingham, Women in Maths videos
See https://www.youtube.com/playlist?list=PLpRE0Zu_k-BzU0p1ccpVy15R7a__exwcA for the new videos from the University of Nottingham on Women in Maths.Filed under: Teaching
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7:00 AM | Naukas Bilbao 2014 y las matemáticas
Como ya viene siendo tradición (¿lo veis? a veces la tradición no es mala cosa) el último fin de semana de septiembre se celebra en Bilbao el mayor evento de divulgación científica en español. Me refiero al Evento Naukas Bilbao 2014.El evento se celebrará el viernes 26 y sábado 27 en el Paraninfo de la UPV/EHU y en él, muchos colaboradores del blog NAUKAS.COM impartirán minicharlas de divulgación de 10 minutos. Un espectáculo en el que ciencia, rigor y claro que sí, humor, se dan […]
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7:00 AM | 1796
1796 =  2 x 2 x 449.1796 is the palindrome 2110112 in base 3 (A043002).1796 is the number of lines through exactly 10 points of a 52 x 52 grid of points (A018817).1796 is the sum of 11 nonzero 8th powers (A003389).1796 has a representation as a sum of two squares: 1796 = 142 + 402.1796 divides 674 - 1.In the year 1796, Carl Friedrich Gauss proved that a regular 17-gon can be constructed using only compass and straightedge.Source: OEIS
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5:40 AM | En el infinito, las cosas no son lo que parecen
Dividir un número entre cero no da como resultado un número infinitamente grande. La razón es que la división se define como una multiplicación a la inversa: si se divide entre cero, y luego se multiplica por cero, debería recuperarse el número con el que se comenzó. Sin embargo, multiplicar infinito por cero da como resultado cero, y ningún otro número. No hay nada que pueda ser multiplicado por cero para dar un […]
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5:30 AM | Space Invaders
I burned through all of my extra lives in a matter of minutes, and my two least-favorite words appeared on the screen: GAME OVER (Ernest Cline, Ready Player One) Inspired by the book I read this summer and by this previous post, I decided to draw these aliens: Do not miss to check this indispensable document to choose […]
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5:00 AM | Les mathématiques peuvent-elles jouer un rôle dans l'éducation à l'égalité ?
En juin 2014, l'abandon de l'expérience des ABCD de l'égalité menée durant l'année 2013-2014 devant plus de 600 classes, est annoncé par le ministre de l'Éducation nationale. - Le débat du 18...
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5:00 AM | (x, why?) Mini: On a Plane!
(Click on the comic if you can't see the full image.) (C)Copyright 2014, C. Burke.Or maybe get Dierks on a plane? Don't try this at home, especially if the plane isn't level.
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4:21 AM | This Week in Fractions
This week we planned to do "Fractions".I know - stand alone content taught out of context.So I shook it up a bit and made a website full of lots of fun activities.Here it is. Hope you enjoy looking at it.http://year5fractions.weebly.com
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3:24 AM | That Jeff Koons feeling
Jed Perl opposes Jeff Koons: The sculptures and paintings of this fifty-nine-year-old artist are so meticulously, mechanically polished and groomed that they rebuff any attempt to look at them, much less feel anything about them. But four paragraphs later: Koons knows how to capitalize on the guilty pleasure that the museumgoing public takes in all […]
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2:57 AM | Multiscale Structure via Information Theory
We have scienced: B. Allen, B. C. Stacey and Y. Bar-Yam, “An Information-Theoretic Formalism for Multiscale Structure in Complex Systems” [arXiv:1409.4708]. We develop a general formalism for representing and understanding structure in complex systems. In our view, structure is the totality of relationships among a system’s components, and these relationships can be quantified using information […]
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2:35 AM | Integer Rules
Noticing how my students struggle with their integer operations, I put together these simple posters. Hopefully, they'll serve as enough reminder for some of my students who are almost to proficiency. How do you address integers in the later grades? Mathematically yours, Miss B
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2:34 AM | Dirac, Pauli and You
Here is Paul Dirac in October 1927: If we are honest — and scientists have to be — we must admit that religion is a jumble of false assertions, with no basis in reality. The very idea of God is a product of the human imagination. It is quite understandable why primitive people, who were […]
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2:13 AM | modular tables
No, not a post about IKEA furniture. A while  ago I put up a post on colouring multiplication tables by assigning ranges of numbers a colour value. You end up with something that looks like a rainbow.This image was made in Tinkerplots, so it was easy to go from a 10 x 10 table to a 50 x 50 table (removing the numbers and just keeping the colours, and shrinking each cell down a bit):Inspired by the "Zn Multiplication visualizer" found here and mentioned here, and thinking about modular […]
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12:24 AM | Student blogging ... excited to share!
Student blogging ... excited about the possibilities!  Sharing a post written today by one of my students ...If you have a chance, check out our blog URLs listed here ... and provide an encouraging comment to students!Math in the newsCategories: BlogSeptember 17, 2014 @ 12:00 PM 2 Comments      While looking through the news, I found an interesting article about sharks and math. A bio researcher named  Andy Reynolds believed to have […]
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12:19 AM | Placement Data News
Over the past three years I have collected and reported on placement data for positions in academic philosophy. (Interested readers can find past posts here at New APPS under the "placement data" category, two of which have been updated with the new data, several posts at ProPhilosophy, or the very...
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12:16 AM | “That’s not an array.”
This child made it clear that She knew that an array was a rectangle That this was technically a rectangle These super-long folks were not arrays, or at least she didn’t think they were, because they didn’t look like a rectangle The 2 x 17 was an array To what do you attribute this perception? (You can check your… Continue reading →
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12:06 AM | Another Great 4th grade fraction resource
Here is a great 4th grade fraction resource.  Copy and paste to view. http://maccss.ncdpi.wikispaces.net/file/view/4thGradeUnit.pdf Happy Mathing, Dr. Nicki

September 17, 2014

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11:55 PM | turnit-off-and-onagain: Why can we never learn the interesting...
turnit-off-and-onagain: Why can we never learn the interesting side of maths
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11:18 PM | Tilting at windmills
Don Quixote September 29, 2014 is the 467th birthday of Spanish author Miguel de Cervantes, whose immortal Don Quixote is widely regarded as one of the greatest works of literature in any language. In fact, in 2002 the Norwegian Book Club named Don Quixote as “best literary work ever written” in their listing of the Continue reading Tilting at windmills
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11:08 PM | Meet The Class Of 2014 (MacArthur Fellows): Jacob Lurie
Meet The Class Of 2014 (MacArthur Fellows): Jacob Lurie: MacArthur Foundation: Lurie embraces an extraordinary breadth of vision—rewriting large swathes of mathematics from a new point of view—while also working to apply his foundational ideas to prove important new theorems in other areas. With an entire generation of young theorists currently being trained on Lurie’s new foundations, his greatest impact is yet to come. [source: mme rss]
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11:00 PM | On This Day in Math - September 18
Lisez Euler, lisez Euler, c'est notre maître à tous.(Read Euler, read Euler, he is our master in everything.)—~Pierre-Simon LaplaceThe 261st day of the year; 261 is the number of possible unfolded tesseract patterns. (I  just learned recently that Charles Howard Hinton coined the term tesseract  (4-dimensional "cube").  He is also the inventor of the baseball  pitching gun.) (see Baseball and the Fourth Dimension) EVENTS1820 André Marie AMPÈRE describes electromagnetic […]
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11:00 PM | Poundstone on People and Predictions
"Rock Breaks Scissors"  by William Poundstone I keep seeing William Poundstone's latest book, "Rock Breaks Scissors" in the 'business' sections of bookstores… which I think is ashamed, because a lot of readers who would enjoy it may miss it there. More appropriately, and like most Poundstone books, it should be in a science/math area, or perhaps under psychology. Poundstone is one of my
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10:51 PM | Story Time (Algebraically Speaking)
Algebra students have been solving multi-step equations.  Quite a great, semi-sneaky way to review all sorts of topics students should already be “fluent” in – operations with rational numbers, the concept of “isolating the variable”, properties of equality, and so … Continue reading →
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10:28 PM | discoverynews: Sea Urchin-Inspired House Captures Tidal...
discoverynews: Sea Urchin-Inspired House Captures Tidal Energy If you’ve ever dreamed of having a seafront home shaped like a sea urchin — who hasn’t? — then hold onto your swim fins. The Hydroelectric Tidal House, envisioned by architectural designer Margot Krasojević, draws inspiration from some of nature’s weirdest sea creatures — echinoderms like starfish and sea urchins whose symmetrical shapes have long fascinated biologists. Learn more
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10:23 PM | Construction of non-radial solutions for a Lichnerowicz type equation in the whole space
Given and , in this note, we are interested in construction of non-radial solutions for the following Lichnerowicz type equation in the whole space . The construction is basically due to Louis Dupaigne and mainly depends on the unique radial solution of the following equation Clearly, this equation comes from the Lichnerowicz type equation by […]
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10:14 PM | my life as a mixture [slides]
Here are the slides of my talk today at the BAYSM’14 conference in Vienna. Mostly an overview of some of my papers on mixtures, with the most recent stuff…Filed under: pictures, Statistics, Travel, University life Tagged: Austria, BAYSM 2014, church, mixtures, slides, Universität, Vienna, Wien
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9:51 PM | "Over the last century-and-a-half, mathematicians found every possible multiplication table. The..."
“Over the last century-and-a-half, mathematicians found every possible multiplication table. The largest irreducible multiplication-table, dubbed the Monster Group, contains 808017424794512875886459904961710757005754368000000000 = 2⁴⁶×3²°×5⁹×7⁶×11²×13³×17×19×23×29×31×41×47×59×71 interlocking pieces. That’s like the number of atoms in Jupiter.” - Richard Borcherds (modified by me)
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9:30 PM | Toronto schools scoring higher in reading and writing, but falter in math
Toronto schools scoring higher in reading and writing, but falter in math: Caroline Alphonso and Kate Hammer: Math has emerged as a challenge for Canadian educators as international standardized test scores have been steadily falling in every province except Quebec. Parents have been appealing to the ministries of education to take a back-to-basics approach to teaching math, emphasizing repetition and drills over problem solving. Alberta has been the only province to bend to pressure from […]
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9:28 PM | Real Work v. Real World
“Make the problem about mobile phones. Kids love mobile phones.” I’ve heard dozens of variations on that recommendation in my task design workshops. I heard it at Twitter Math Camp last month. That statement measures tasks along one axis only: the realness of the world of the problem. But teachers report time and again that […]
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