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11:14 PM | Challis Lectures

I had a great time during this short visit in the Department of Statistics, University of Florida, Gainesville. First, it was a major honour to be the 2014 recipient of the George H. Challis Award and I considerably enjoyed delivering my lectures on mixtures and on ABC with random forests, And chatting with members […]

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10:41 PM | A temperature puzzle

Last Friday morning (the 14th) it was unseasonably cold in Atlanta. On the way to work I noticed my car’s display giving the following temperature readings: 28, 30, 32, 34, 36 – all in Fahrenheit. It somehow knew to avoid … Continue reading →

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1:30 PM | 11/22/14

1 * 1 * 2 * 2 * 1 = 4
Also:
1 * 1 / (2 + 2) = 1 / 4
Also:
1 * 1 * 2 / 2 = 1^4
Also:
1 + 1= 2 = 2 = 1 * √4

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12:16 PM | A HoTT PhD position in Ljubljana

I am looking for a PhD student in mathematics. Full tuition & stipend will be provided for a period of three years, which is also the official length of the programme. The topic of research is somewhat flexible and varies from constructive models of homotopy type theory to development of a programming language for a […]

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The Poynting vector represents energy in the electromagnetic fields and is given by Students often read it as the “pointing vector”, but Poynting was a person, not a direction. Here are his own words. A SPACE containing electric … Continue reading →

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9:23 AM | Interlude in St Andrews

A fortnight in St Andrews was intended to be a little rest after a busy few months. It didn’t work out that way. Several mathematical things which I will report on later, including a visit from my collaborator Celia Glass … Continue reading →

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12:57 AM | A general parity problem obstruction

Many problems and results in analytic prime number theory can be formulated in the following general form: given a collection of (affine-)linear forms , none of which is a multiple of any other, find a number such that a certain property of the linear forms are true. For instance: For the twin prime conjecture, one […]

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11:14 PM | a pile of new books

I took the opportunity of my weekend trip to Gainesville to order a pile of books on amazon, thanks to my amazon associate account (and hence thanks to all Og’s readers doubling as amazon customers!). The picture above is missing two Rivers of London volumes by Ben Aaraonovitch that I already read and left at […]

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Sólo una breves líneas para recordaros que la próxima edición del Carnaval de Matemáticas, la Edición 5.8 Betty Scott, se celebrará del 23 al 30 de noviembre (vamos, la próxima semana) en el blog Tocamates.Esta edición estará dedicada a la matemática y estadística americana Elizabeth Scott que el próximo 23 de noviembre cumpliría 97 años.Para participar en esta edición, hay que hacer lo de siempre:Publicar, entre el 23 y el 30 de noviembre algún contenido que
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6:39 PM | Hindley-Milner for chemlambda

Some notes about Hindley-Milner in #chemlambda . It turns out that is pretty simple to do something very intuitive. The starting point is the mol file which encodes a graph molecule. Let me recall how this works. The ingredients of a molecule are some nodes, which have ports. Nodes can be red, green, yellow or … Continue reading Hindley-Milner for chemlambda →

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3:00 PM | Explore Longform with Writing 201

Explore longform writing in our newest Blogging U. course, Writing 201: Beyond the Blog Post. The fun starts Monday, December 1 -- learn more and register today!

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1:18 PM | some LaTeX tricks

Here are a few LaTeX tricks I learned or rediscovered when working on several papers the past week: I am always forgetting how to make aligned equations with a single equation number, so I found this solution on the TeX forum of stackexchange, Namely use the equation environment and then an aligned environment inside. Or […]

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Judging from his published papers Merton was already expert at continuous time finance before the 1973 option pricing papers came out. A Digression on Itó Processes To apply the dynamic programming technique in a continuous-time model, the state variable dynamics … Continue reading →

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I recently gave a public talk about George Green’s mathematical education and influences, the audio for which is now available online. Green attended Robert Goodacre’s school in Nottingham 1801-2 and took part in scientific culture in Nottingham, including at Bromley House Library, in the 1810s and 20s, before going to Cambridge in 1833. I speak... Read more »

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2:18 AM | New Series: Moduli of Riemann Surfaces

Though I’m not quite ready to start (next week!) I feel that, in the spirit of Jim getting back to the blogging and my continued promises, I’d announce my series now. I’m going to start a detailed series on the … Continue reading →

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On December 10, I will alas not travel to London to attend the Read Paper on sequential quasi-Monte Carlo presented by Mathieu Gerber and Nicolas Chopin to The Society, as I fly instead to Montréal for the NIPS workshops… I am quite sorry to miss this event, as this is a major paper which brings […]

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7:20 PM | limbo IPA

Filed under: pictures, Travel, Wines Tagged: ÌPA, Limbo IPA, Long Trail Brewing Company, Maine, USA, Vermont

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$\newcommand\P{\mathbb{P}}\newcommand\Q{\mathbb{Q}}\newcommand\R{\mathbb{R}} \newcommand\of{\subset}\newcommand\cross{\times}$ I’d like to explain a topic from my recent paper G. Fuchs, J. D. Hamkins, J. Reitz, Set-theoretic geology, to appear in the Annals of Pure and Applied Logic. We just recently made the final revisions, and the paper … Continue reading →

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6:23 PM | The Geometry of Restricted Partitions

Last week, I attended the IMA Workshop on Geometric and Enumerative Combinatorics which was, hands down, the best conference I have ever attended. The speaker lineup was simply amazing and I return brimming with ideas for future projects and collaborations. I felt, therefore, particularly honored to be invited to speak in front of this audience, given that so many of my personal “academic heroes”, who I have cited so often, were present.
Given these high stakes, I am delighted to
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10:30 AM | La circunferencia de Conway

En muchas ocasiones hemos visto que la geometría en general, y la del triángulo en particular, nos puede proporcionar resultado preciosos a la par que inesperados. Éste es el caso del que os voy a mostrar en esta entrada, que además de ser una maravilla geométrica nos da la forma de construir la que en […]Entra en Gaussianos si quieres hacer algún comentario sobre este artículo, consultar entradas anteriores o enviarnos un mensaje.Construye tú también el
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While trying to do Statistical Mechanics simulations a group of physicists at Los Alamos faced the problem of simulating from the canonical distribution. The method they created was generalized by Hastings to the become the Metropolis-Hastings workhorse of statistics. Notice … Continue reading →

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Robert Thomason suggests the following in his article The classification of triangulated subcategories: The reader may find the indirectness of the proof of this useful corollary psychologically uncomfortable. If so, rather than dosing himself with a benzodiazepine, he may find relief in deducing Corollary 2.3 from the following criterion for equality of two classes in […]

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4:15 AM | On proof and progress in feminism

The recent allegations against several celebrities have led to a broader conversation on how we, as a society, don’t believe women. In a “he said, she said” situation, we trust the man and assume that the woman is either mistaken … Continue reading →

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3:26 AM | Two Versus Three

The role of 2 and 3 in mathematics Electrika source Margaret Farrar was the first crossword puzzle editor for The New York Times. Ken fondly recalls seeing her name while watching his father do the daily and weekly NYT puzzles—they were under Farrar’s byline as editor until 1969 when she retired from the Times. More […]

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11:36 PM | ANU hiring postdocs

Amnon Neeman has just put up an ad for two postdoctoral positions at the ANU. He says: “The successful applicants should have strong research interests and activities in or related to one of the following fields: Algebraic Geometry, Commutative Algebra, Representation Theory, Algebraic Topology, Algebraic K-Theory. Skills at applying the techniques of triangulated categories to […]

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11:14 PM | Bayesian evidence and model selection

Another arXived paper with a topic close to my interests, posted by Knuth et al. today. Namely, Bayesian model selection. However, after reading the paper in Gainesville, I am rather uncertain about its prospects, besides providing an entry to the issue (for physicists?). Indeed, the description of (Bayesian) evidence is concentrating on rough approximations, in […]

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6:46 PM | The Imitation Game

This season’s Hollywood math/physics extravangza is starting to come to an end. For coverage of the Breakthrough Prize ceremony, I enthusiastically recommend Michael Harris’s new piece at Slate which just appeared. The final high profile production, one promoted at the … Continue reading →

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In some situations you may have conflicting information from different sources about a subject. The resulting confusion in your thinking is called cognitive dissonance. It may happen that a person suffering cognitive dissonance suppresses one of the ways of understanding in order to resolve the conflict. For example, at a certain stage in learning English, […]

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Winifred Edgerton Merrill fu la prima americana ad ottenere un dottorato in matematica presso la Columbia University nel 1886. Nella sua tesi sviluppò una rappresentazione geometrica degli infinitesimi in diversi sistemi di coordinate, utilizzando lo jacobiano per per derivare le trasformazioni tra gli integrali nei diversi sistemi.Tra matematica e astronomiaNata a Ripon, nel Wisconsin, il 24 settembre del 1862 da Emmet e Clara Edgerton, si trasferisce con la famiglia a New York intorno al […]

Kelly S.E. & Rozner S.A. (2012). Winifred Edgerton Merrill: "She Opened the Door", Notices of the American Mathematical Society, 59 (04) 504-512. DOI: http://dx.doi.org/10.1090/noti818

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Winifred Edgerton Merrill fu la prima americana ad ottenere un dottorato in matematica presso la Columbia University nel 1886. Nella sua tesi sviluppò una rappresentazione geometrica degli infinitesimi in diversi sistemi di coordinate, utilizzando lo jacobiano per per derivare le trasformazioni tra gli integrali nei diversi sistemi.Tra matematica e astronomiaNata a Ripon, nel Wisconsin, il 24 settembre del 1862 da Emmet e Clara Edgerton, si trasferisce con la famiglia a New York intorno al […]

Kelly S.E. & Rozner S.A. (2012). Winifred Edgerton Merrill: "She Opened the Door", Notices of the American Mathematical Society, 59 (04) 504-512. DOI: http://dx.doi.org/10.1090/noti818

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Direi che oggi pomeriggio è stato un bel respirare, al Palazzo Brera. Cristina Lazzeroni dell'Università di Birmingham è venuta alle 18 (come avevo scritto nel post precedente) per raccontare del bosone di Higgs, del modello standard e di materia e antimateria. E' una sperimentale presso l'esperimento LHCb al CERN, l'esperimento dedicato proprio alla ricerca su uno dei grandi misteri dell'universo: perché in esso c'è un eccesso di materia (e d'altra parte se non fosse così, non ci sarebbe […]

Aaij R., B. Adeva, M. Adinolfi, C. Adrover, A. Affolder, Z. Ajaltouni, J. Albrecht, F. Alessio, M. Alexander & S. Ali & (2013). First Observation of CP Violation in the Decays of B_{s}^{0} Mesons, Physical Review Letters, 110 (22) DOI: http://dx.doi.org/10.1103/physrevlett.110.221601

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Per i I cieli di Brera, il 24 settembre (domani... scusate per il ritardo nell'annuncio...) alle 18 presso la Sala delle Adunanze dell'Istituto Lombardo nel Palazzo Brera sito in via Brera 28 (Milano), si terrà la conferenza La fisica delle particelle e il Large Hadron Collider: recenti sviluppi e questioni aperte: Cristina Lazzeroni ci introdurrà alla fisica delle particelle e agli studi fatti al Large Hadron Collider del Cern di Ginevra mettendo l’accento su recenti sviluppi come la
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Aad G., J. Abdallah, S. Abdel Khalek, O. Abdinov, R. Aben, B. Abi, S. H. Abidi, M. Abolins, O. S. AbouZeid & H. Abramowicz & (2014). Measurement of the Higgs boson mass from the $H\to \gamma \gamma $ and $H\to Z{Z}^{*}\to 4\ell $ channels in $pp$ collisions at center-of-mass energies of 7 and 8 TeV with the ATLAS detector, Physical Review D, 90 (5) DOI: http://dx.doi.org/10.1103/physrevd.90.052004

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One of the exciting things about mathematical oncology is that thinking about cancer often forces me to leave my comfortable arm-chair and look at some actually data. No matter how much I advocate for the merits of heuristic modeling, when it comes to cancer, data-agnostic models take second stage to data-rich modeling. This close relationship […]

Gallaher, J. & Anderson, A.R. (2013). Evolution of intratumoral phenotypic heterogeneity: the role of trait inheritance., Interface Focus, 3 (4) 20130016. arXiv: 1305.0524v1

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freakonometrics tweeted: @freakonometrics

"The 100 Year Marriage Trend in the UK" http://t.co/MLsxzMU75k http://t.co/5FIeMLcSin

2014-11-23 12:43:26

freakonometrics tweeted: @freakonometrics

P["Michael Smith"] = P["Michael"] x P["Smith"] (quite a strong assumption) http://t.co/JOtrRBAHOP by @MonaChalabi http://t.co/mXKXXtNkDq

2014-11-23 12:40:16

freakonometrics tweeted: @freakonometrics

"Tweets linking to Academic Journals" http://t.co/2B6y4TrMeu (in July 2011) http://t.co/Am23jxbrUR

2014-11-23 12:31:17

freakonometrics tweeted: @freakonometrics

"Graphical Perception and Graphical Methods for Analyzing…" https://t.co/mSEWK8cVJn see also http://t.co/g4iFaE0YDZ https://t.co/ggO4m3fjpp

2014-11-23 12:29:00

freakonometrics tweeted: @freakonometrics

"R language" vs "data visualization" http://t.co/ot2hp4BoXa http://t.co/mVdOA4Cirv

2014-11-23 12:23:46

mathfour tweeted: @mathfour

Are you doing hard core lessons this week or cool #Thanksgiving #math #crafts? Try some of these! http://t.co/Fzt3a1I6jP #edchat #txed

2014-11-23 12:17:13

freakonometrics tweeted: @freakonometrics

"Human intelligence is withering as computers do more, but there’s a solution" http://t.co/VBNckwlRW3 see also http://t.co/NE6rS6osra

2014-11-23 12:16:10

mathhombre tweeted: @mathhombre

RT @mathsjem 5 maths teaching ideas http://t.co/uvRg7qTJPa … #mathschat < #mathgame, @crstn85's #nixthetricks, more

2014-11-23 11:39:01

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