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Posts

March 30, 2015

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11:33 AM | What If?
My favorite question is, “Why?” (And my favorite answer is, “Because.”) But not far behind is the question, “What if?” What if a baseball player swings a bat with the proper speed, but starts swinging 0.01 seconds too late? What if I could earn 6.3% on a real estate investment instead of 1.4% in a Roth IRA, but had […]
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11:20 AM | Sangakoo a El Singular Digital
El passat 19 de març la secció de Cultura de El Singular Digital es va fer ressó de les Aules Virtuals Sangakoo. Podeu llegir-ne l’article sencer aquí. I recordeu que si voleu provar la plataforma, tan sols cal que us registreu. Si en canvi, voleu incorpor Sangakoo a la vostra classe, ens podeu escriure a […]
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11:04 AM | I accept mathematical bribes
Last Friday I traveled to American University and gave an evening talk, where I met Jeffrey Hakim, a mathematician and designer who openly bribed me. Don’t worry, it’s not that insidious. He just showed me his nerdy math wallet and said I could have one too if I blogged about it. I obviously said yes. […]
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10:34 AM | Minimal landscape maps
Designer Michael Pecirno experiments with single-subject maps in his project Minimal Maps. No boundaries, just landscape. The data provided by the USDA is incredible and includes a tremendous wealth of…Tags: agriculture, USDA
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10:12 AM | [DMANET] One PhD Position in Random Graphs and Combinatorics at TU Graz
----------------------------------------------------------------------------------------------One PhD Position in Random Graphs and Combinatorics at TU Graz ----------------------------------------------------------------------------------------------We are seeking outstanding PhD candidates with interest and experience in random graphs, probabilistic combinatorics, analytic combinatorics, graph theory.http://www.math.tugraz.at/~kang/PhDposition-DK2015.pdfThe successful PhD candidate will […]
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9:32 AM | CERN and Discern
via SeperateIntegrate
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9:08 AM | I RAGAZZI DELLE SCUOLE PRIMARIE DEL PIEMONTE INCONTRANO LA GRANDE SCIENZA
Oltre 350 alunni delle scuole primarie di Torino e del Piemonte, con le loro insegnanti, saranno i protagonisti del workshop di divulgazione scientifica per gli studenti della scuola primaria promosso dalla Fondazione Giovanni Agnelli, insieme all’Associazione CentroScienza Onlus e all’Ufficio Scolastico Regionale del Piemonte, con la collaborazione di Torino2015 Capitale Europea dello Sport, Comau SpA, Juventus FC, Mauto e Associazione Subalpina Mathesis.Al workshop interverranno, fra gli […]
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9:02 AM | More oligopolistic behavior
Even very simple models require attention to detail. In [link] we described simple model from the literature. A related model with a coupling constraint that limits pollution emissions is described in: Jacek Krawczyk and James Zuccollo, NIRA-3: An improved MATLAB package for finding Nash equilibria in infinite games, Victoria University of Wellington, December 2006 Lars Mathiesen, Regulation of pollution in a Cournot equilibrium, The Norwegian School of Economics and Business […]
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9:00 AM | Newtonian Weapons
The ponderous instrument of synthesis, so effective in Newton's hands, has never since been grasped by anyone who could use it for such purpose; and we gaze at it with admiring curiosity, as some gigantic implement of war, which stands idle among the memorials of ancient days, and makes us wonder what manner of man he was who could wield as a weapon what we can hardly lift as a burden. - William Whewell on Newton’s geometric proofs, 1847 (thanks to JWS for pointing this out to me).
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9:00 AM | Book review: Secrets of Creation (Volume I)
In honesty, I wasn’t expecting to enjoy this book. As a general rule, press releases that come my way — unless they’re very tightly targeted — can expect to find their way into my ‘spam’ folder. Matthew Watkins’ Secrets of Creation was a little lucky to escape that fate. Maybe it caught me in a good mood. In fact, it must have done: the title points directly at what the kind of misty profundity that Alfred North Whitehead suggested was an indication of […]
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8:45 AM | New Math
Just finishing off my Tom Lehrer appreciation month.
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8:29 AM | Epitaffio a Dulcinea
Dopo quasi sette anni e qualche migliaio di chilometri di viaggi insieme la mia cara Dulcinea mi ha lasciato.O meglio, se la sono portata via. Al suo posto ho trovato i resti metaforici di una catena spezzata.Nei prossimi giorni, o forse dopo Pasqua, dovrò procurarmi una degna erede. E, visto che  non ho cambiato idea dal 2008, l'erede sarà rigorosamente da donna.Il misfatto è avvenuto nottetempo difronte alla biblioteca universitaria. Avevamo lasciato le bici lì perché, dopo una […]
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7:50 AM | Math Problem 96: Coordinate Geometry, Area of Triangle
No summary available for this post.
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6:39 AM | Pharmacy ethics
‘You have heard that it was said to those of ancient times, “You shall not murder”; and “whoever murders shall be liable to judgement.”  But I say to you that if you are angry with a brother or sister, you will be liable to judgement.  Matthew 5:21-22In practice, we have to distinguish. Whoever murders is liable to judgement, but being angry isn’t enough. In the same way, formal codes of professional ethics come in two versions: the aspirational code that describes the way we […]
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6:00 AM | Il problema di marzo (559) - Prima della primavera
Ordunque, stravolti da un equinozio eclittico ed eclettico (eclittico per via dell'eclissi, eclettico perchè il maledetto ha deciso di alternare cielo sereno e cielo coperto a sua lieta discrezione, e a noi è toccata la discrezione più discreta, ovvero il cielo nuvoloso. Ma per una trentina di secondi, l'abbiamo vista lo stesso, l'abbiamo. Ecco.)...uh? dicevamo? [...]
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5:30 AM | Calculations vs. 3D CAD – A historical curiosity
**Guest post by Al Dean**   When you...
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3:54 AM | Subtracting Across Zeros
Here is a great method for subtracting across zeros. Happy Mathing, Dr. Nicki
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2:17 AM | Each cycle of colours is about $256 e$ as many iterations...
one can do only so much with fixed-size mantissa Each cycle of colours is about $256 e$ as many iterations ‘till escape as the cycle outside it.
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1:31 AM | A Semi-Circle Conjecture
At the very start of the school year in geometry, we started by having students make observations and write down conjectures based on their observations. We had a very fruitful paper folding activity, which students — through perseverance and a lot of conversation with each other — eventually were able to explain. However we also […]
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1:24 AM | Aspect ratios and not starting at zero
The vertical axis on a bar chart must start at zero. The very rare exceptions are ones that prove the rule: where ‘zero’ isn’t zero. Otherwise, the axis starts at zero or it isn’t a bar chart. The whole point of bar charts is that the length of the bar is proportional to the data value. […]
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1:22 AM | Birthdays are great!
Hello people I miss dearly. So, it’s an unknown fact that my birthday is meant to be celebrated for two whole weeks (one before and one after). Fortunately, the Peruvians were up for it and we celebrated my birthday with … Continue reading →
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1:04 AM | Math Teachers at Play 84
Welcome to the 84th Math Teachers at Play Blog Carnival!84 is a portentous number. It's the sum of twin primes (What's the previous sum of twin primes? Next?). It's thrice perfect, twice everything.  It's positively Orwellian. It's even a town in Pennsylvania. It's a game (actually a variant of the domino game 42 if you play with 2 sets.) It is the #edtech that shall not be named.(click for full size image)84 puzzler 1: Number the intersections of these five circles with the integers 1 to […]
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1:00 AM | A Networked World (Part 2)
guest post by David Spivak Creating a knowledge network In 2007, I asked myself: as mathematically as possible, what can formally ground meaningful information, including both its successful communication and its role in decision-making? I believed that category theory could be useful in formalizing the type of object that we call information, and the type […]
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12:59 AM | curiosamathematica: An impossible Penrose triangle, available...
curiosamathematica: An impossible Penrose triangle, available as a T-shirt print.
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12:17 AM | Optimization Pro and Con
A tweet by Nate Brixius (@natebrix) led me to read the article "The Natural Order and Divine Order of Optimization" published by the Wisconsin Institute for Discovery, a rebuttal/counterpoint to a New York Times Magazine article titled "A Sucker is Optimized Every Minute". The former sings the praises of optimization (somewhat) and the latter vilifies it (somewhat).As someone whose research focuses on optimization, I'm generally in the pro camp, but I'll concede that it can be overdone. One of […]

March 29, 2015

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11:29 PM | [DMANET] CFP - JCDCG^2 2015, Sept, 14-16, Kyoto, Japan
--- 1st Call For Papers --- The 18th Japan Conference on Discrete and Computational Geometry and Graphs (JCDCG^2 2015) Date: September 14--16, 2015 Conference Site: Clock Tower Centennial Hall, Kyoto University, Kyoto, Japan Web Site: http://www.kurims.kyoto-u.ac.jp/~takazawa/JCDCGG2015/ Submission Deadline: July 1, 2015 ---- The 18th Japan Conference on Discrete and Computational Geometry and Graphs (JCDCG^2 2015) will be held on September 14-16, 2015 at the Clock Tower Centennial Hall, […]
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11:11 PM | Dean’s Corner – First Edition
I’m a little late in getting around to updating my blog (Natural Blogarithms) on my recent change in position at Wayland.  As of February 23, 2015, I am now the Dean of the School of Mathematics and Sciences.  (See Press Release) Below is my first contribution to the “quarterly” newsletter.  I hope you’ll check it out […]
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11:01 PM | Are We Too Soft on Our Students?
“The Corps has…” This lesser known phrase, uttered frequently by members of the Long Gray Line, graduates of the United States Military Academy at West Point, reminisces about the perceived softness present at the Academy in the eyes of the … Continue reading →
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11:00 PM | On This Day in Math - March 30
Jaime Escalante *WikA mathematician is a person who can find analogies between theorems; a better mathematician is one who can see analogies between proofs and the best mathematician can notice analogies between theories. One can imagine that the ultimate mathematician is one who can see analogies between analogies. ~Stefan BanachThe 89th day of the year; 89 is the fifth Fibonacci prime and the reciprocal of 89 starts out 0.011235... (generating the first five Fibonacci numbers) *Prime […]
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10:59 PM | CFP - JCDCG^2 2015, Sept, 14-16, Kyoto, Japan
[apologies for cross posting] --- 1st Call For Papers --- The 18th Japan Conference on Discrete and Computational Geometry and Graphs (JCDCG^2 2015) Date: September 14--16, 2015 Conference Site: Clock Tower Centennial Hall, Kyoto University, Kyoto, Japan Web Site: http://www.kurims.kyoto-u.ac.jp/~takazawa/JCDCGG2015/ Submission Deadline: July 1, 2015 ---- The 18th Japan Conference on Discrete and Computational Geometry and Graphs (JCDCG^2 2015) will be held on September 14-16, 2015 at […]
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