X

+

La búsqueda de funciones que generen números primos ha sido una constante en (prácticamente) toda la historia de las matemáticas. Los números primos, los “ladrillos” con los que se construyen los números naturales, han sido siempre un conjunto de números esquivo en el sentido de encontrar una expresión que los genere indefinidamente. Sabiendo esto, encontrar […]

+

Learn a bit about the 27 lines on a smooth cubic surface.

+

A fairly good race in Argentan, despite (relatively) hot weather that saw the winning time increase by two minutes and a half. (Last year’s winner actually lost 3 and half minutes on the same track). Gaining 18 seconds over my time from last year was thus a significant achievement. This was my 17th—or 18th including […]

+

9:30 PM | Michigan Math In Action

Those of you who are interested in college math instruction may be interested in a no-longer-so-new blog “Michigan Math In Action”, which a number of our faculty started last year. (I was involved in the sense of telling people “blogs are fun!”, but haven’t written anything for them yet.) It mostly features thoughtful pieces on […]

+

When signing up for physics grad school, I didn’t expect to be interviewed by a comedienne on a spoof science show about women in STEM. Last May, I received an email entitled “Amy Poehler’s Smart Girls.” The actress, I read, had … Continue reading →

+

The Board of Governors’ rejection this week of the Faculty Association’s request for accountability in President Gupta’s resignation marks the low point of shared or faculty governance at the University of British Columbia. It’s a shame that UBC sunk to rock bottom … Continue reading →

+

10:30 AM | (Vídeo) Pi and the Mandelbrot Set

Nuevo vídeo de Numberphile, en esta ocasión hablando sobre el conjunto de Mandelbrot y la relación del número Pi con este fantástico conjunto. Diversas imágenes en las que se hace zoom en el conjunto de Mandelbrot. Concretamente, hablan de la relación entre Pi y el conjunto de Mandelbrot que presentábamos aquí en esta entrada (¿que […]

+

I’m glad you enjoy it!

+

10:58 PM | 275A, Notes 1: Integration and expectation

In Notes 0, we introduced the notion of a measure space , which includes as a special case the notion of a probability space. By selecting one such probability space as a sample space, one obtains a model for random events and random variables, with random events being modeled by measurable sets in , and […]

+

10:15 PM | Banff snapshot [#3]

Filed under: pictures, Travel Tagged: Alberta, Banff, Banff Centre, BIRS, Canada, Canadian Rockies, Fall

+

11:22 AM | Aveiro, 2

After two weeks in Aveiro, I know a little more about the place. The high-prowed boats that carry boatloads of tourists along the canals have a very different origin. They originally carried seaweed to farmers’ fields for use as fertiliser. … Continue reading →

+

10:15 PM | moral [dis]order

“For example, a religiously affiliated college that receives federal grants could fire a professor simply for being gay and still receive those grants. Or federal workers could refuse to process the tax returns of same-sex couples simply because of bigotry against their marriages. It doesn’t stop there. As critics of the bill quickly pointed out, […]

+

9:00 PM | Experience report: oral final exam

This past spring I taught a standard data structures course (stacks, queues, binary trees, heaps, asymptotic analysis, that kind of thing). Inspired by a group I participated in exploring pedagogy and course design—led by the wonderful Betsy Burris—I decided to … Continue reading →

+

6:54 PM | Accidental pies

This is the blackboard from the University of Edinburgh School of Mathematics common room from September 2015. I particularly noticed it because of the inadvertent appearance of P(ies) in the centre! I’m also enjoying the idea of pulsational energy.

+

When I started the ‘Og, in 2008, I was about to run the 23rd edition of the Argentan half-marathon… Seven years later, I am once again getting ready for the race, after a rather good training season, between the mountains of the North Cascade and the track of Malakoff. with the last week in England, […]

+

3:39 PM | Oddities

A few odd things that I’ve run into recently: The IAS has a weekly meeting to discuss current topics in HEP theory. From their events calendar, next week’s meeting will be devoted to “The Cosmological Constant and the String Landscape”, … Continue reading →

+

7:31 AM | Open science

I have written a three-part post for the CoDiMa blog on Open Science. The first part, open publication, is here; the remaining parts on open data and open software will appear in the next couple of days. Readers of various … Continue reading →

+

You know you’re a Parisian intellectual when you are invited to make a totally gratuitous comment in Le Monde. That has never happened to me, so however I may walk, talk, and quack, Brendan Larvor’s diagnosis of my status remains hypothetical. And I can’t really say that Leila Schneps, whom I strongly suspect for numerous […]

+

Vivek Roy, Aixian Tan and James Flegal arXived a new paper, Estimating standard errors for importance sampling estimators with multiple Markov chains, where they obtain a central limit theorem and hence standard error estimates when using several MCMC chains to simulate from a mixture distribution as an importance sampling function. Just before I boarded my […]

+

Bei der All-Russischen Mathematikolympiade, der höchsten Stufe nationaler Olympiaden in Russland, gibt es immer wieder mal auch Aufgaben, die “praktischen” Problemen nachempfunden sind. 2009 zum Beispiel hatte man eine Aufgabe: Unter einer von n im Kreis angeordneten Tassen ist eine Münze versteckt. Mit jedem Zug darf man 4 Tassen auswählen und überprüfen, ob unter ihnen…

+

9:30 AM | Una de mates – Magia matemática

Segundo programa de Órbita Laika y segunda entrega de la sección Una de mates por parte de Raúl Ibáñez. El vídeo de esta semana se titula Magia matemática. Ahí va: Espero vuestras opiniones, pero tengo que decir que a mí este vídeo me ha gustado algo menos. La razón es muy sencilla: queda la posibilidad […]

+

1:52 AM | Personalizing Classroom Design

"I’ve seen first-hand how teachers are making an effort to “modernize” their own classrooms. Some teachers have ditched desks and moved towards tables."

+

When the Web Sketchpad team created the interface for tools, there were lots of design decisions to be made. We made the best choices we could at the time, but after months of daily use, it became clear that at least one aspect of tool functionality needed some rethinking. In the original design of tools (which you […]

+

A misleading title if any! Carlos Albert arXived a paper with this title this morning and I rushed to read it. Because it sounded like Bayesian analysis could be expressed as a special form of simulated annealing. But it happens to be a rather technical sequel [“that complies with physics standards”] to another paper I […]

+

8:50 PM | An exact square from a Reedy category

Any Reedy category has a canonical square of inclusions of subcategories and this square is exact.

Sidebar

Filters

+

di diffusione della scienza e rivoluzioni cc @aubreymcfato @CristianCantoro Utilizzare i dati sulle citazioni in Wikipedia per misurare la diffusione dell'open accessScrivevo all'inizio del 2011 per i festeggiamenti del wiki-decennale di una rivoluzione irreversibile. E' stato piuttosto interessante leggere il titolo che technology review ha utilizzato per raccontare dell'ultimo degli articoli dedicati all'enciclopedia libera: Why Wikipedia + Open Access = Revolution.L'idea degli autori, Misha
[…]

Nielsen, F. (2007). Scientific citations in Wikipedia, First Monday, 12 (8) DOI: 10.5210/fm.v12i8.1997

Heather Ford, Shilad Sen, David R. Musicant & Nathaniel Miller (2013). Getting to the source: where does Wikipedia get its information from?, Proceedings of the 9th International Symposium on Open Collaboration, DOI: 10.1145/2491055.2491064

Misha Teplitskiy, Grace Lu & Eamon Duede (2015). Amplifying the Impact of Open Access: Wikipedia and the Diffusion of Science, Wikipedia Workshop at 9th International Conference on Web and Social Media (ICWSM), arXiv: 1506.07608v1

Citation

+

After (or before?) @StartsWithABang's balloon animals' post? A couple of week ago Ethan Siegel published a post about ballon animals, so I decide to repost an old piece that I wrote in 2011 for my italian blog: the english version is lost, but it is magically reposted here! Two one-balloon constructions and their associated graphsI recently discovered this interesting site, vihart. In the site there are some interesting paper and today I want to write something about Computational Balloon
[…]

Demaine E.D., Demaine M.L. & Hart V. (2008). Computational balloon twisting: The theory of balloon polyhedra., Proceedings of the 20th Canadian Conference on Computational Geometry (CCCG2008), 139-142.

Bryś K. & Lonc Z. (2009). Polynomial cases of graph decomposition: A complete solution of Holyer's problem, Discrete Mathematics, 309 (6) 1294-1326. DOI: 10.1016/j.disc.2008.01.054

Citation

+

Supponiamo di doverci confrontare con un animale, ad esempio un cane o un lupo (o più in generale con un animale, addomesticato o selvaggio). Secondo Konrad Lorenz il comportamento aggressivo di un cane viene influenzato da due stati d'animo differenti: l'ira e la paura.Si può allora provare a prevedere il comportamento del cane in funzione di quale dei due stati domina: nel caso in cui l'animale è dominato da paura o da ira, proporre una previsione è abbastanza semplice; nel caso in cui il […]

Zeeman E.C. (1976). Catastrophe Theory, Scientific American, 234 65-83. DOI: 10.1038/scientificamerican0476-65

Jean Petitot (2013). Complexity and self-organization in Turing, The Legacy of A.M. Turing, (E. Agazzi, ed.), Franco Angeli, Milano, 149-182. arXiv: 1502.05328v1

Citation

+

Non prevedevo di scrivere la versione italiana di un post sull'ultima news proveniente dal RHIC, ma mi è stato gentilmente chiesto, e provvedo ben volentieri. Inizio, però, con un piccolo cappello, alla fine del quale saprete che c'è anche un piccolissimo pezzetto (il doppio diminutivo è perché i firmatari del papero su arXiv sono veramente tanti) d'Italia in questa interessante scoperta.Tutto nasce da un post, nel flusso twittero, di Annalisa Arci, in cui racconta, in maniera e con un […]

Belavina A.A., Polyakova A.M., Schwartza A.S. & Tyupkina Y.S. (1975). Pseudoparticle solutions of the Yang-Mills equations, Physics Letters B, 59 (1) 85-87. DOI: 10.1016/0370-2693(75)90163-X

Hooft G.'. (1976). Symmetry Breaking through Bell-Jackiw Anomalies, Physical Review Letters, 37 (8) DOI: 10.1103/PhysRevLett.37.8

Hooft G.'. (1976). Computation of the quantum effects due to a four-dimensional pseudoparticle, Physical Review D, 14 DOI: 10.1103/PhysRevD.14.3432

Fukushima K., Kharzeev D.E. & Warringa H.J. (2008). The Chiral Magnetic Effect, Physics Review D, 78 (7) DOI: 10.1103/PhysRevD.78.074033

Kharzeev D.E. & Yee H.U. (2011). Chiral Magnetic Wave, Physical Review D, 83 DOI: 10.1103/PhysRevD.83.085007

STAR Collaboration (2015). Observation of charge asymmetry dependence of pion elliptic flow and the possible chiral magnetic wave in heavy-ion collisions, arXiv, arXiv: 1504.02175v2

Citation

+

A new clue about the #quarkgluonplasma from @RHIC_STAR at @BrookhavenLabWithin the particles that constitute atomic nuclei, protons and neutrons, there are the quarks, the elementary particles with fractional charges, linked to each other thanks to the gluons, bosons that carry the nuclear interaction. Thanks to the gluons it is impossible to observe, at present, free quarks, but it is expected that in the very first stage of the universe, matter was in a state called quark-gluon plasma. Thanks […]

Belavina A.A., Polyakova A.M., Schwartza A.S. & Tyupkina Y.S. (1975). Pseudoparticle solutions of the Yang-Mills equations, Physics Letters B, 59 (1) 85-87. DOI: 10.1016/0370-2693(75)90163-X

Hooft G.'. (1976). Symmetry Breaking through Bell-Jackiw Anomalies, Physical Review Letters, 37 (8) DOI: 10.1103/PhysRevLett.37.8

Hooft G.'. (1976). Computation of the quantum effects due to a four-dimensional pseudoparticle, Physical Review D, 14 DOI: 10.1103/PhysRevD.14.3432

Fukushima K., Kharzeev D.E. & Warringa H.J. (2008). The Chiral Magnetic Effect, Physics Review D, 78 (7) DOI: 10.1103/PhysRevD.78.074033

Kharzeev D.E. & Yee H.U. (2011). Chiral Magnetic Wave, Physical Review D, 83 DOI: 10.1103/PhysRevD.83.085007

STAR Collaboration (2015). Observation of charge asymmetry dependence of pion elliptic flow and the possible chiral magnetic wave in heavy-ion collisions, arXiv: 1504.02175v2

Citation

rmathematicus tweeted: @rmathematicus

RT @HPS_Vanessa: The Greenwich Longitude exhibition on tour - coming to a museum near you in North America or Australia maybe? http://t.co/…

2015-10-05 17:38:18

rmathematicus tweeted: @rmathematicus

RT @bhgross144: And speaking of @neiltyson, this @mcsweeneys piece is a must-read for #histSTM, #scicomm & #CosmosChat types: http://t.co/e…

2015-10-05 17:34:06

rmathematicus tweeted: @rmathematicus

RT @divbyzero: Today is a palindrome date in D/M/YY form: 5/10/15

2015-10-05 17:29:34

rmathematicus tweeted: @rmathematicus

RT @EngineerLife_: 'Putting synthetic biology in historical context: Becoming a Tralfamadorian' by @HPSGlonk for our blog http://t.co/9Ukgt…

2015-10-05 17:28:41

rmathematicus tweeted: @rmathematicus

RT @NCSE: New excerpt from Don Prothero's latest book! "The Story of Life in 25 Fossils". http://t.co/YOtEFIP5Ea http://t.co/AYviLGvDA2

2015-10-05 17:28:15

rmathematicus tweeted: @rmathematicus

RT @JenLucPiquant: Here's the Drawing That Proved the Earth Has a Solid Core http://t.co/hL4emNsBHX

2015-10-05 17:26:53

rmathematicus tweeted: @rmathematicus

RT @historecipes: Don't miss this! A 17thC recipe book. 12 hours. 208 pages. And transcribers from around the world. http://t.co/VPb8Mz8ses

2015-10-05 17:26:43

rmathematicus tweeted: @rmathematicus

RT @Annapwilliams: This exhibit highlights how little scholarly attention has been paid to homosexuality http://t.co/jYhGOrWkI7

2015-10-05 17:26:33

X