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Posts

September 16, 2014

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6:54 PM | Leonard Susskind sull'universo
Guarda un po' il caso. In una discussione su Quora riguardo le possibilità di visualizzare oggetti di dimensioni superiori a 3, fa capolino Leonard Susskind, che, spero ricorderete, ho citato scrivendo un paio di cose sul principio olografico. Di Susskind viene segnalata una intervista per l'Enonomist, di cui vi traduco l'estratto più strettamente collegato con l'universo.L'universo si sta ancora espandendo? E se sì, di quanto si può espandere, ed nel caso imploderà?No, no, no. Prima che […]
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7:21 AM | What makes a mathematical proof beautiful?
(Cross-posted at NewAPPS)In December, I will be presenting at the Aesthetics in Mathematics conference in Norwich. The title of my talk is Beauty, explanation, and persuasion in mathematical proofs, and to be honest at this point there is not much more to it than the title… However, the idea I will try to develop is that many, perhaps even most, of the features we associate with beauty in mathematical proofs can be subsumed to the ideal of explanatory persuasion, which I take to be the […]
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6:20 AM | Linkage
Unexpected shapes in smoke plumes, as photographed by Thomas Herbrich (G+)ISAAC 2014 and COCOA 2014 accepted paper lists (G+)FOCS 2014 program and best paper winners (G+)Kinetic sculpture made of wooden balls on threads, with some extensive software simulation behind its design (G+)How a 19th century math genius taught us the best way to hold a pizza slice, or, a practical application of the theorem that when a flat surface is embedded in 3d, it remains flat in at least one direction […]
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2:40 AM | Exploring Climate Data (Part 2)
guest post by Blake Pollard I have been learning to make animations using R. This is an animation of the profile of the surface air temperature at the equator. So, the x axis here is the longitude, approximately from 120° E to 280° E. I pulled the data from the region that Graham Jones specified […]
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1:34 AM | A crucial missing piece in the Pistorius trial? (i)
Time for a break with a “Rejected Post”[i] There’s one crucial point that Prosecutor Nell overlooked and failed to employ in the Oscar Pistorius trial–or so it appears. In fact I haven’t heard anyone mention it—so maybe it’s not as critical as I think it is. Before revealing (what I regard as the crucial missing […]

September 15, 2014

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11:42 PM | Algebra: it matters
I’m looking at two different models for learning polynomial functions, and trying to determine if they are equivalent. After a couple days of thinking, I’ve reduced the question to the following: Can every symmetric polynomial of degree \(r\) in \(d\) variables that has no constant term be written as a sum of the \(r\)-th powers […]
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10:51 PM | Richard Lipton Wins Knuth Prize
Georgia Tech professor and fellow blogger Richard Lipton will receive the 2014 Knuth Prize at the upcoming FOCS conference in Philadelphia. The Knuth Prize is given jointly by the ACM SIGACT and the IEEE TC-MFCS for major research accomplishments and contributions to the foundations of computer science over an extended period of time. Lipton's research has major results across a large spectrum of theoretical computer science from probabilistic algorithms to DNA computing to […]
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9:09 PM | A Solved Problem in Ornithology
Marbled Murrelets are cute birds, for long time, with a mystery. This article starts with "The nest and nesting habits of the Marbled Murrelet remain unknown. This is the more remarkable when it is  remembered that the bird is common throughout the summer season from Alaska and Kodiak Islands south to Washington, and that many able field naturalists have sought to penetrate the mystery of its home life.''  and ends with, ``Which Ornithological detective will solve the […]
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8:44 PM | La Sunmobile della General Motors
Su Corrierino e Giornalino, qualche giorno fa, è stata pubblicata la scannerizzazione di una pagina con due trafiletti di Mauro Janni del 17 gennaio 1965 in cui quello superiore è dedicato all'automobile solare della General Motors. In effetti l'automobile solare, la Sunmobile, è un modellino di poco meno di 40 cm costruito da William Cobb e presentato il 31 agosto del 1955 a un motor show a Chicago. Il modello, in legno di balsa, presentava 12 piccoli pannelli solari su tutta la parte […]
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3:10 PM | Edinburgh Scientist Fergus McInnes Missing [in Switzerland?]
An unusual and serious post. Fergus McInnes, 51, scientist from the School of Informatics, Edinburgh University, is missing. He boarded a flight to go to a conference in Switzerland but did not check into his hotel, attend the conference, or board his return flight. He has not been seen or heard from since. (read more) If […]
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12:36 PM | [오키나와 여행 04] 호텔 리뷰 – 테라스가든 미하마 리조트
오키나와에서 첫번째 밤을 보낸 숙소, 테라스 가든 미하마 리조트(Terrace Garden Mihama Resort)를 리뷰한다. 이 호텔 주변 관광지로는 선셋비치, 아메리칸 빌리지 등이 있다. 일단 외관은 아래와 같이 상당히 허접한 모습:   오른쪽에 보이는 흰색 건물이다. 하지만 내부는 예상했던 것 이상으로 상당히 … Continue reading →Related Posts ?[오키나와 여행 03] 선셋(Sunset) 비치의 […]
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11:14 AM | 1976 NBER-Census Time Series Conference
What a great blast from the past -- check out the program of the 1976 NBER-Census Time-Series Conference. (Thanks to Bill Wei for forwarding, via Hang Kim.)The 1976 conference was a pioneer in bridging time-series econometrics and statistics. Econometricians at the table included Zellner, Engle, Granger, Klein, Sims, Howrey, Wallis, Nelson, Sargent, Geweke, and Chow. Statisticians included Tukey, Durbin, Bloomfield, Cleveland, Watts, and Parzen. Wow!The 1976 conference also clearly […]
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8:34 AM | Why are Indians so good at code?
Cheryll Baron offers a historical explanation: “Indian software aptitude rests on an unlikely pair of factors: an emphasis on learning by rote in Indian schools, and a facility and reverence for abstract thought. These biases of Indian education are all but mutually exclusive in the modern West, where a capacity for abstraction is closely associated with […]

September 14, 2014

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9:37 PM | How space is born (0)
This opens a new series of posts, which will turn us back to the “computing with space” theme, the main interest here at chorasimilarity. Look again at the move R2 of graphic lambda calculus.   The epsilon and mu are, originally, elements of a commutative group. Suggestions have been made repeatedly that the commutative group […]
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8:21 PM | Appendice: Atom, Topolino, Flash Gordon e il fico strangolatore
Queste poche righe sarebbero dovute comparire nel post dedicato a L'armata Hot Dog, ma la memoria, fino a settimana scorsa, ha difettato. Poi, grazie allo stimolo del volume Le follie di Eta Beta, ecco che la memoria ritorna.Iniziamo con la scena dalla storia lunare in cui Atom si trova invischiato tra i tentacoli guardiani lasciati dal perduto popolo dei lunatici: La drammatica scena ricorda e non poco una analogamente drammatica scena disegnata da Floyd Gottfredson ne La spia poeta in cui […]
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7:50 PM | Experiments with inertia
a coulpe of home experiments about #inertia from Science Comics #2
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7:07 PM | On Waiting
When you ask people what they are doing, they usually say they are doing a project, starting it, finishing it, or looking for one. I am in that exquisite state of "waiting", a pressurized promise of something to happen, it is out of my control, but I anticipate it any moment, and when it happens, my muscles, brain and bones have to respond, explode into action. Sonatine by the unbeatable Beat Takeshi is a great ode to waiting  where a gang waits by the beach -- pick on each other, invent […]
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4:00 AM | Consequences of Triadic Relation Irreducibility : 2
From time to time I come to the realization that there are ways of reading Peirce that make no sense to me.  When I stop to think about the potential sources of that evident divergence from common sense, the first … Continue reading →
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3:30 AM | Defining empathy, sympathy, and compassion
When discussing the evolution of cooperation, questions about empathy, sympathy, and compassion are often close to mind. In my computational work, I used to operationalize-away these emotive concepts and replace them with a simple number like the proportion of cooperative interactions. This is all well and good if I want to confine myself to a […]

September 13, 2014

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9:57 PM | Bren Hall, East Stairs
Just some test shots with my new travel lens (Canon's 17-40/F4 L, replacing a mysteriously nonfunctional and optically not as good 17-85IS).
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7:30 PM | Consequences of Triadic Relation Irreducibility : 1
2014 Sep 10 I will have to be out of the loop for some days, but this post will give me a peg on which I can hang a few thoughts via mobile device that have been tugging at the … Continue reading →
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4:37 PM | Lo zio Oswald e il Roald Dahl che non ti aspetti
via Cinque cose belleMia sorella mi ha ricordato che oggi è il Roald Dahl Day, così ecco la recensione di un romanzo sorprendente, inedito in Italia.Se siete uno di quegli adulti che amano Roald Dahl per le sue storie per bambini, se siete uno di quegli adulti che ritiene Il GGG il più bel libro mai scritto in assoluto, allora state lontani da Lo zio Oswald: potrebbe non piacervi.Il romanzo di Dahl, fino a qualche tempo fa ancora inedito in Italia, aggiunge un nuovo tassello alla sua […]
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11:57 AM | A two-body problem (cryptic short story)
A friend wrote this short story on the two-body problem. It’s rather cryptic, but it is about love and maths…  
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2:37 AM | “The Supernal Powers Withhold Their Hands And Let Me Alone” : C.S. Peirce
Memory Lane* in Honor of C.S. Peirce’s Birthday: (Part 3) of “Peircean Induction and the Error-Correcting Thesis” Deborah G. Mayo Transactions of the Charles S. Peirce Society 41(2) 2005: 299-319 Part 1 is here, Part 2, here. 8. Random sampling and the uniformity of nature We are now at the point to address the final move […]

September 12, 2014

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7:36 PM | Leggere Lolita a Teheran
Un po' di anni fa mi parlarono molto bene di questo libro ma non lo presi subito, e me ne dimenticai. L'anno scorso mi ritornò in mente e lo misi nella mia lista dei desideri: desiderio realizzato!Il libro inizia con un incontro segreto, un seminario letterario al quale partecipano 7 donne. Viene organizzato dalla protagonista (e scrittrice) del libro a casa sua, dove possono sentirsi libere di non coprirsi con il velo e sfoggiare colori e accessori, sentirsi libere di essere sé stesse e […]
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4:36 PM | Gold OA with CC licence, Green OA without and a lesson from the dispute between Amazon and Hachette
Further are some data along with my speculations, which may be or may be not accurate, due to my limited understanding. Hey, everybody has a limited understanding, here is mine! TL;DR> The crux of the matter is in this part of  any recent CC 4.0 licence: in Section 2/Scope/a. Licence grant/5. “5. Downstream recipients. Offer […]
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4:15 PM | The Very Short Teach Yourself Logic Guide
I seem to have gone full circle! The very first instalment of the TYL Study Guide was a short blogpost here. Then things grew. And grew. Until we get to the current 100 page PDF monster — and that’s only as short(!) … Continue reading →
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2:00 PM | [오키나와 여행 03] 선셋(Sunset) 비치의 여유로운 오후
호텔에서 체크인을 하고 무거운 짐을 내려 놓은 후 선셋 비치에 바람을 쐬러 나와 봤다. 역시 겨울에도 따뜻한 오키나와! (한겨울의 오키나와는 한국이나 일본의 초가을 날씨 정도 되는 듯 하다)   여기가 아마 선셋비치 입구인듯?! 선셋 비치는 말 그대로 해가 질 때 … Continue reading →Related Posts ?[오키나와 여행 02] 호텔 체크인과 아메리칸 빌리지 탐방[오키나와 여행 […]
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9:57 AM | Are academics being silenced by their own universities?
Article in the Times Higher Education Supplement by Chris Parr: Attempts to ‘gag and silence’ academics are commonplace
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5:45 AM | 414/514 Homework 1 – The reals
This set is due in two weeks, on Friday September 26, at the beginning of lecture. 1. Recall that in the construction of the reals via Dedekind cuts, a real is simply the left set of a pair in a cut of , that is, a “real” is a set that is non-empty, bounded above, […]
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