Posts

January 19, 2015

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1:18 PM | je suis Raif
Filed under: Uncategorized Tagged: Amnesty International, blogging, freedom of speech, Je suis Charlie, Raif Badawi, religions, Saudi Arabia
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1:00 PM | Mathematics, Live: A Conversation with Amal Fahad and Rasha Osman, Part II
I had the pleasure of attending the 2nd annual Heidelberg Laureate Forum in September. Modeled after the Lindau Nobel Laureate Meetings, it brings together recipients of prestigious awards in... -- Read more on ScientificAmerican.com
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10:44 AM | L'uomo che vedeva gli atomi
Un meccanico "anarchico", Bud Gregory, è l'unico in grado di salvare la Terra dai disastri, più o meno naturali, che si stanno abbattendo sul pianeta.L'unico scienziato in grado di comprendere tali pericoli e apprezzare l'abilità intuitiva di Gregory nel costruire oggetti in grado di sfruttare leggi della fisica appena intuite se non addirittura non scoperte è David Murfree.I due, grazie a macchine che sembrano in grado di produrre una sorta di moto perpetuo […]
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12:44 AM | What’s in a Particle?
What’s in a Particle? If you’ve read or heard anything about quantum mechanics, you’ve heard the phrase “particle-wave duality.” The common wisdom is that this means that particles sometimes behave like waves and sometimes behave like particles. And although this is right, it’s a bit … Continue reading → The post What’s in a Particle? appeared first on The Physics Mill.
Editor's Pick

January 18, 2015

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11:15 PM | post-grading weekend
Now my grading is over, I can reflect on the unexpected difficulties in the mathematical statistics exam. I knew that the first question in the multiple choice exercise, borrowed from Cross Validation, was going to  be quasi-impossible and indeed only one student out of 118 managed to find the right solution. More surprisingly, most students […]
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4:33 PM | L'isola dei segreti
Anne: Lo zero. E' un numero?Jamie: Si e no. Puoi dire che lo è, perché lo usi come un numero all'interno di sistemi numerici. O almeno, lo usi nello stesso modo in cui usi i numeri. Per esempio, nel numero 507 lo zero si comporta come un numero. Significa che non ci sono decine nel numero, solo centinaia e unità. D'altro canto, dato che tutto il senso dello zero è che indica l'assenza di un numero, non può essere davvero uno di loro.Ne La scacchiera di John […]
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2:11 PM | Lee Sechrest
Yesterday we posted on Lewis Richardson, a scientist who did pioneering work in weather prediction and, separately, in fractals, in the early twentieth century. I was pointed to Richardson by Lee Sechrest, who I then googled. Here’s Sechrest’s story: His first major book [was] “Psychotherapy and the Psychology of Behavior Change” . . . Sechrest […] The post Lee Sechrest appeared first on Statistical Modeling, Causal Inference, and Social Science.
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10:38 AM | Assemblaggio di un telescopio
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4:18 AM | What I learned at the Joint Math Meetings
Another Joint Meetings in the books!  My first time in San Antonio, until last weekend the largest US city I’d never been to.  (Next up:  Jacksonville.)  A few highlights: Ngoc Tran, a postdoc at Austin, talked about zeroes of random tropical polynomials.  She’s proved that a random univariate tropical polynomial of degree n has about […]

January 17, 2015

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11:28 PM | The Sea Island Mathematical Manual
I was never knew a lot of things about how mathematics evolved in China and a couple of days ago I have found this incredible picture on Tumblr: Illustration of Liu Hui’s sea island survey methods. Published in 263 AD as an appendix to The Nine Chapters on the Mathematical Art, Liu Hui constructed mathematical […]
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11:14 PM | another terrible graph
Le Monde illustrated an article about discriminations against women with this graph which gives the number of men for 100 women per continent. This is a fairly poor graph, fit for one of Tufte’s counterexamples, as the bars are truncated at 85, make little sense as they do not convey the time dimension, are dwarfed […]
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4:30 PM | Lo Hobbit di Peter Jackson annotato
Dopo il successo, non certo esente da critiche, della trilogia cinematografica de Il Signore degli Anelli, per Peter Jackson era importante affrontare la sfida de Lo Hobbit, il romanzo che ha, in un certo senso, dato inizio a tutto.Approcciando il libro, Jackson ha fatto una scelta cinematograficamente opportuna, trasformando il testo tolkeniano in una trilogia prequel della precedente(1). Dato questo punto di partenza, Jackson ha poi dovuto risolvere altri problemi, primo fra tutti i toni […]
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4:21 PM | The less complicated narratives
Steven Attewell makes good points about Selma: Selma is definitely the best film yet made about the Civil Rights Movement. And I say this because it is, more than a biopic about Martin Luther King Jr. himself, a movie about … Continue reading →
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2:43 PM | Lewis Richardson, father of numerical weather prediction and of fractals
Lee Sechrest writes: If you get a chance, Wiki this guy: I [Sechrest] did and was gratifyingly reminded that I read some bits of his work in graduate school 60 years ago. Specifically, about his math models for predicting wars and his work on fractals to arrive at better estimates of the lengths of common […] The post Lewis Richardson, father of numerical weather prediction and of fractals appeared first on Statistical Modeling, Causal Inference, and Social Science.
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2:26 PM | Aunt Pythia’s advice
My, my, my. It’s been a while. Aunt Pythia plum forgot about her duties last Saturday, what with all the math nerds and such in San Antonio. Many apologies! But don’t think Aunt Pythia didn’t miss you, because nothing could be less true: Aunt Pythia positively pined for you this last week. It was excruciating […]
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10:27 AM | 2014: un anno su LSB
Anche se un po' in ritardo, vorrei ricapitolare i miei articoli usciti nel 2014 su Lo Spazio Bianco. Tra approfondimenti, recensioni, e brevisioni e altre cose, l'attività è riassumibile come segue: Approfondimenti80 anni insieme: il Paperino di Federico PedrocchiJoker: l'uomo che rideCrisi Finale: il supereroismo secondo Grant Morrison Recensioni:"Progetto" Enigma: articolo 1, con la recensione vera e propria; articolo 2, con una breve biografia di Alan Turing.Batman, il […]

January 16, 2015

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11:15 PM | lock in [book review]
As mentioned in my recent review of Redshirts, I was planning to read John Scalzi’s most recent novel, Lock In, if only to check whether or not Redshirts was an isolated accident! This was the third book from “the pile” that I read through the Yule break and, indeed, it was a worthwhile attempt as the […]
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3:43 PM | When a study fails to replicate: let’s be fair and open-minded
In a recent discussion of replication in science (particularly psychology experiments), the question came up of how to interpret things when a preregistered replication reaches a conclusion different from the original study. Typically the original, published result is large and statistically significant, and the estimate from the replication is small and not statistically significant. One […] The post When a study fails to replicate: let’s be fair and open-minded appeared first on […]
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1:43 PM | What meaning can and cannot be: Lessons from real life, Part 2
The problem of fictional discourse -- do statements involving fictional objects have truth-values or are they truth-valueless; if the former, how are these truth values determined? -- is one that goes back at least to Frege (his views on the compositionality of language and what the referent of a sentence is entail that sentences which have non-referring parts have no truth-value) and for which no adequate solution has yet been found, given, e.g., the publication of books such as Tim Crane's […]
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1:22 PM | Cross-validation, LOO and WAIC for time series
This post is by Aki. Jonah asked in Stan users mailing list Suppose we have J groups and T time periods, so y[t,j] is the observed value of y at time t for group j. (We also have predictors x[t,j].) I’m wondering if WAIC is appropriate in this scenario assuming that our interest in predictive accuracy is for […] The post Cross-validation, LOO and WAIC for time series appeared first on Statistical Modeling, Causal Inference, and Social Science.
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12:39 PM | Anteprima recensione: Annhilator e il buco nero di Fraser Irving
Questa volta estraggo, ma non come screenshot, una parte della recensione di "Annihilator", ultimo fumetto di Grant Morrison che sta arrivando in Italia a ridosso dell'edizione originaleI conigli sono degli animali estremamente prolifici, quasi leggendari nel loro tasso di riproduzione, tanto che Leonardo Fibonacci proprio grazie a questi simpatici roditori scoprì la serie che oggi porta il suo nome: 1 1 2 3 5 8 13 21 e così via, e dove ogni numero è la somma dei due […]

Vogel H. (1979). A better way to construct the sunflower head, Mathematical Biosciences, 44 (3-4) 179-189. DOI: http://dx.doi.org/10.1016/0025-5564(79)90080-4

Mack D.R. (1990). The magical Fibonacci number, IEEE Potentials, 9 (3) 34-35. DOI: http://dx.doi.org/10.1109/45.101398

Antonucci R. (1993). Unified Models for Active Galactic Nucle and Quasars, Annual Review of Astronomy and Astrophysics, 31 (1) 473-521. DOI: http://dx.doi.org/10.1146/annurev.aa.31.090193.002353

Urry C.M. (1995). Unified Schemes for Radio-Loud Active Galactic Nuclei, Publications of the Astronomical Society of the Pacific, 107 803. DOI: http://dx.doi.org/10.1086/133630

Ferrarese L. (2000). A Fundamental Relation between Supermassive Black Holes and Their Host Galaxies, The Astrophysical Journal, 539 (1) L9-L12. DOI: http://dx.doi.org/10.1086/312838

Hamaus N., Paumard T., Müller T., Gillessen S., Eisenhauer F., Trippe S. & Genzel R. (2009). Prospects for testing the nature of Sgr A*'s near-infrared flares on the basis of current very large telescope - and future very large telescope interferometer - observations, The Astrophysical Journal, 692 (1) 902-916. DOI: 10.1088/0004-637X/692/1/902

Gravett P. (2008). De Luca and Hamlet: Thinking Outside the Box, European Comic Art, 1 (1) 21-36. DOI: http://dx.doi.org/10.3828/eca.1.1.3

Citation
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11:50 AM | Representation of women and the genius myth
In a recent issue of Science, there was an article entitled Belief that some fields require ‘brilliance’ may keep women out (hat tip Gary Cornell) that absolutely resonates with my experiences, both as a mathematician and as a teacher. Namely, it talks about the extent to which women are discouraged to go into a field because that […]
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5:22 AM | Call for Papers: LORI-V (Deadline May 18)
Call for PapersThe Fifth International Conference on Logic, Rationality and Interaction (LORI-V)October 28-31, 2015Taipei, TaiwanThe International Conference on Logic, Rationality and Interaction (LORI) conference series aims at bringing together researchers working on a wide variety of logic-related fields that concern the understanding of rationality and interaction (http://golori.org). The series aims at fostering a view of Logic as an interdisciplinary endeavor, and supports the creation of […]
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4:16 AM | Linkage
Real-time 3d special effects in modern dance (G+)How not to react to conference talks that happen to be presented by women (G+, including also an unrelated report from the SODA business meeting)Photos of icy landscapes showing how varied the geometry of ice can be (G+)New ACM fellows (G+)n-body choreagraphies (strange solutions to the n-body problem in which all bodies follow each other along a curve; more and still more; G+)Men (on the Internet) don’t believe sexism is a problem in […]

January 15, 2015

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11:47 PM | Hackerare la satira
E' notizia di oggi quella del Corriere che mette in piedi un volume dedicato a Charlie Hebdo utilizzando le vignette dei fumettisti italiani, semplicemente dimenticandosi di contattarli per chiedere il permesso e magari un file in alta risoluzione (cose che non solo sono educate, ma fanno smadonnare i grafici un po' meno di quanto avranno probabilmente fatto...).Al di là delle polemiche sul metodo utilizzato dal Corriere o dalla difesa del diritto d'autore, penso che chiunque abbia il […]
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11:15 PM | Harold Jeffreys’ default Bayes factor [for psychologists]
“One of Jeffreys’ goals was to create default Bayes factors by using prior distributions that obeyed a series of general desiderata.” The paper Harold Jeffreys’s default Bayes factor hypothesis tests: explanation, extension, and application in Psychology by Alexander Ly, Josine Verhagen, and Eric-Jan Wagenmakers is both a survey and a reinterpretation cum explanation of Harold […]
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9:34 PM | The bracket!
That’s right, we’re getting ready for the battle to choose the best seminar ever. Paul Davidson, who send in the image below, writes: Knocked together in Excel. I’m European, so I may not have respected the North American system for brackets i.e. I split each category into seeded pools and randomly drew from them. The […] The post The bracket! appeared first on Statistical Modeling, Causal Inference, and Social Science.
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2:55 PM | I need your help in setting up the ultimate bracket: Picking the ideal seminar speaker
This came in the departmental email awhile ago: CALL FOR APPLICATIONS: LATOUR SEMINAR — DUE DATE AUGUST 11 (extended) The Brown Institute for Media Innovation, Alliance (Columbia University, École Polytechnique, Sciences Po, and Panthéon-Sorbonne University), The Center for Science and Society, and The Faculty of Arts and Sciences are proud to present BRUNO LATOUR AT […] The post I need your help in setting up the ultimate bracket: Picking the ideal seminar speaker […]
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1:58 PM | The Black Box Society by Frank Pasquale
There’s a new book out, called The Black Box Society and written by Frank Pasquale, a lawyer focused on technology and a friend of mine. It’s published by Harvard University Press and it looks like this: To be honest, when I first received it I was a bit worried that it would make my book, […]
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4:45 AM | A year in books: philosophy, psychology, and political economy
If you follow the Julian calendar — which I do when I need a two week extension on overdue work — then today is the first day of 2015. Happy Old New Year! This also means that this is my last day to be timely with a yet another year-in-review post; although I guess I […]
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