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Salvador Dalí, Crucifixion (Corpus Hypercubus), 1954

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2:10 PM | Spatiologies – Vittorio Giorgini

Walking Tall – Vittorio Giorgini [1980-81] Vittorio Giorginis early architectural works allude to the topological features of continuous surfaces like the Möbius strip or the paradoxical, and non-orientable, Klein bottle. His signature compound curvature buildings such as the Casa Saldarini in Italy and the Liberty Center in New York State (unfinished and latter demolished) expose […]

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12:18 PM | Good Friday

(Click on the cartoon to see the full image.) (C)Copyright 2014, C. Burke.Or possibly labeled "Passion, Death, Resurrection"? Good Friday is part of the Paschal Triduum, which can also be spelled "Pascal", but I wanted to avoid confusion and basically hang a lampshade on it.

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11:31 AM | Where nobody lives

We've seen the map of where everyone lives. Now here's the reverse of that by Nik Freeman: where nobody lives …

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mathani:
Get you best paper, cut a circle and fold it, fold it so that the circumference falls on a fixed point inside. Repeat, using random folds. Now see the creases. This is how you paper-fold an ellipse.

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mathhombre:
From Shouldn’t We Teach GEOMETRY?, Branko Grunbaum, The Two-Year College Mathematics Journal, Vol. 12, No. 4 (Sep., 1981), pp. 232-238
I will read anything by Grunbaum.

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s-c-i-guy:
Women in Science Interactive
Women in Science, a new interactive tool, presents the latest available data for countries at all stages of development. Produced by the UNESCO Institute for Statistics, the tool lets you explore and visualize gender gaps in the pipeline leading to a research career, from the decision to get a doctorate degree to the fields of research women pursue and the sectors in which they work.
source

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nnekbone:
The Google doodle celebrates Percy Julian on Friday, April 11, 2014.
Percy Lavon Julian (April 11, 1899, Montgomery, Al. – April 19, 1975, Waukegan, Illinois) was a U.S. research chemist and a pioneer in the chemical synthesis of medicinal drugs from plants.[1]He was the first to synthesize the natural product physostigmine, and a pioneer in the industrial large-scale chemical synthesis of the human hormones, steroids, progesterone, and testosterone, from plant
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Ruggedized scientific calculator perfect for extreme math
By Tim Hornyak, IDG News Service
It laughs at splashes, dust and shocks. It eats military-spec drop tests for breakfast. It’s ideal for math in the great outdoors.
Meet Casio’s new ruggedized scientific calculator, the fx-FD10 Pro.
Mainly aimed at land surveyors, the device has 21 programs for civil engineering purposes such as curve calculations for plotting road construction.
The 250-gram FD-10 Pro is housed in an elastomer-coated
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6:55 PM | "If Tomorrow Starts Without Me"

My cousin Patricia (she'll always be "Patty" to me) read the following poem at her mother's funeral yesterday. (That would be my Aunt Pat.) There wasn't a dry eye in the place. And if that didn't get you, then her sister Debbie, in her eulogy, remembering those who have left us since last August did: my Mom, their sister Barbara, my niece Lisa and most recently, our cousin Mary Ann. To that, I'll add a few more: my Uncle Eddie (on the other side of the family) last week, my colleague Ms.
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The Fluctuating Math Errors in Americans’ Tax Returns
4:40 PMApr 15 By Mona Chalabi
Seeing as Tuesday night is the deadline for filing tax returns, and seeing as data is FiveThirtyEight’s raison d’être, I was excited to find a set of statistics titled “Math Errors on Individual Income Tax Returns, by Type of Error.” Even better, that data has been published for tax years from 2001 to 2012.
It’s unsurprising that some Americans make mistakes on their taxes; the 1040
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See How Cadbury Hatches 350 Million Goo-Filled Eggs a Year
By Elise Craig
04.17.14
Candy company Mondelēz International only sells Cadbury Créme Eggs from January through Easter, but its factories fill chocolate shells with gooey cream 364 days a year. It’s the only way to ensure 350 million eggcellent candies are ready for their plastic-grass-lined baskets. Easter shift manager (his actual title) Charles McDonald shows us how the Cadbury factory in Birmingham, England,
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Scale-Free Mathematics in Matzah?
By Samuel Arbesman
04.14.14
Tonight is Passover. And the most well-known food of the holiday is matzah, the cracker-like flatbread. Within this food we can find some complexity science goodness.
At one part of the Seder meal, we break one piece of matzah into half. Now, for anyone who has actually tried this, one recognizes the great difficulty in doing so. Matzah does not break evenly. It too often breaks along fracture points that cause a piece of matzah
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3:14 PM | Broken Balance

CD cover of Astra "Broken Balance" (2014)
http://im-possible.info/english/art/misc/cd/astra.html

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12:28 PM | A principal component analysis step-by-step

Sebastian Raschka offers a step-by-step tutorial for a principal component analysis in Python. The main purposes of a principal component …

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10:40 AM | Analysis of Bob Ross paintings

As a lesson on conditional probability for himself, Walt Hickey watched 403 episodes of "The Joy of Painting" with Bob …

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7:35 PM | LEGO Fractals

My daughter has recently started playing with DUPLO blocks pretty consistently, which has me thinking about LEGO—the toy of my youth (and hopefully her’s in a couple of years, too!). In some ways, LEGO is an ideal medium for exploring … Continue reading →

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The Coolest Spaceships Ever Built, Compared by Size | Venus probes Richard Kruse | WIRED.com

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MIT Whizzes Invent Magical Furniture That Changes Shape on Demand
By Liz Stinson
04.15.14
Furniture has traditionally been a static thing. We sit at our tables, in our chairs that hold their stiff, rigid shape no matter what we’re doing or how we’re feeling. As our homes become smarter and more personalized, furniture has almost wholly been left out of the revolution.
It’s a shame. Just imagine if your sofa could sense how you’re feeling when you get home from work. To stave off
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1:06 PM | Funny How Things Work Out

It had been my intention, if I could muster the discipline and determination, to have a new comic each day this week because I'm off. Funny how things work out. It seems like every day is booked with something, the first three days being the worst. Sure, I might have something by Thursday, but that's hardly "every day" of the week. That's catch-up time. There will be an update, and if I can spend Friday working on things, I'll plan out next week ahead of time. I hope. And next Monday and
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12:34 PM | Pastel de Sierpinski

Un pastel tradicional ampliado como triángulo de Sierpinski. Y es que hay matemáticas que están para comérselas. Y todo, todo, todo sobre Sierpisnki en el esquemat de hoy.

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Non voglio fare concorrenza alla splendida spiegazione di Amedeo o a quella tecnica di Corrado, ma mia sorella, leggendo il post di pancia scritto nella sera dell'annuncio di BICEP2, ha candidamente confessato di non aver capito cosa era accaduto quel giorno. E allora proviamoci, a raccontarlo. (da The Cartoon History of the Universe #1 di Larry Gonick)C'era una volta un'idea di universo, che era la Terra al centro, quindi il Sole, la Luna e gli altri pianeti e sullo sfondo le stelle fisse,
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Hubble E. (1929). A relation between distance and radial velocity among extra-galactic nebulae, Proceedings of the National Academy of Sciences, 15 (3) 168-173. DOI: 10.1073/pnas.15.3.168

Gamow G. (1948). The Evolution of the Universe, Nature, 162 (4122) 680-682. DOI: 10.1038/162680a0

Alpher R.A. & Herman R. (1948). Evolution of the Universe, Nature, 162 (4124) 774-775. DOI: 10.1038/162774b0

Alpher R., Bethe H. & Gamow G. (1948). The Origin of Chemical Elements, Physical Review, 73 (7) 803-804. DOI: 10.1103/PhysRev.73.803

Peebles P.J.E., Schramm D.N., Turner E.L. & Kron R.G. (1994). The Evolution of the Universe, Scientific American, 271 (4) 52-57. DOI: 10.1038/scientificamerican1094-52

McLeish T.C.B., Bower R.G., Tanner B.K., Smithson H.E., Panti C., Lewis N. & Gasper G.E.M. (2014). History: A medieval multiverse, Nature, 507 (7491) 161-163. DOI: 10.1038/507161a

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Much of my undergrad was spent studying physics, and although I still think that a physics background is great for a theorists in any field, there are some downsides. For example, I used to make jokes like: “soft isn’t the opposite of hard sciences, easy is.” Thankfully, over the years I have started to slowly […]

Lazer, D., Kennedy, R., King, G. & Vespignani, A. (2014). Big data. The parable of Google Flu: traps in big data analysis., Science, 343 (6176) 1203-1205. PMID: 24626916

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Un triangolo aureo è un triangolo isoscele in cui il rapporto tra uno dei lati uguali con la base è pari alla sezione aurea $\varphi$. Utilizzando un triangolo aureo di lato 1, è possibile dimostrare che \[1 + \frac{1}{\varphi^2} + \frac{1}{\varphi^4} + \cdots = \varphi\] \[\frac{1}{\varphi} + \frac{1}{\varphi^3} + \cdots = 1\] \[\frac{1}{\varphi} + \frac{1}{\varphi^2} + \frac{1}{\varphi^3} + \cdots = \varphi\] Il triangolo aureo qui sopra è lo screenshot della applet realizzata da Irina
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Edwards S. (2014). Proof Without Words: An Infinite Series Using Golden Triangles, The College Mathematics Journal, 45 (2) 120-120. DOI: 10.4169/college.math.j.45.2.120

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Un triangolo aureo è un triangolo isoscele in cui il rapporto tra uno dei lati uguali con la base è pari alla sezione aurea $\varphi$. Utilizzando un triangolo aureo di lato 1, è possibile dimostrare che \[1 + \frac{1}{\varphi^2} + \frac{1}{\varphi^4} + \cdots = \varphi\] \[\frac{1}{\varphi} + \frac{1}{\varphi^3} + \cdots = \1] \[\frac{1}{\varphi} + \frac{1}{\varphi^2} + \frac{1}{\varphi^3} + \cdots = \varphi\] Il triangolo aureo qui sopra è lo screenshot della applet realizzata da Irina […]

Edwards S. (2014). Proof Without Words: An Infinite Series Using Golden Triangles, The College Mathematics Journal, 45 (2) 120-120. DOI: 10.4169/college.math.j.45.2.120

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In 1936, Alonzo Church, Alan Turing, and Emil Post each published independent papers on the Entscheidungsproblem and introducing the lambda calculus, Turing machines, and Post-Turing machines as mathematical models of computation. A myriad of other models followed, many of them taking seemingly unrelated approaches to the computable: algebraic, combinatorial, linguistic, logical, mechanistic, etc. Of course, […]

Dershowitz, N. & Gurevich, Y. (2008). A natural axiomatization of computability and proof of Church's Thesis, Bulletin of Symbolic Logic, 14 (3) 299-350. DOI: 10.2178/bsl/1231081370

Citation

Here is what I get when I analyze Peirce’s “giver of a horse to a lover of a woman” example along the same lines as the dyadic compositions. We may begin with the mark-up shown in Figure 19. (19) If we … Continue reading →

2014-04-18 22:00:35

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2014-04-18 14:13:52

BIRTHDAY CHALLENGE: Pick a line drawing of the Map of Nigeria (like the one below) with the borders of its states included and try to color each state with one […]

2014-04-18 13:25:43

My complete interview with Steven Strogatz in the February 2014 issue of Math Horizons is now freely available. Math Horizons makes one article from each issue freely available online, and I’m thrilled that for the February 2014 issue they chose my piece. Professor Strogatz is an acclaimed mathematician, writer, and teacher, and I think this interview captures a small […]

2014-04-18 13:00:34

gaussianos tweeted: @gaussianos

IMO 2013 en Santa Marta (Colombia) - Problema nº 4 - #AntologíaGaussiana http://t.co/6CStUANIVR

2014-04-18 12:02:03

profkeithdevlin tweeted: @profkeithdevlin

Snowden Calls BS On Putin's Answer: Says He Was Playing The Role Of Ron Wyden http://t.co/fglozmOaFn

2014-04-18 11:55:34

profkeithdevlin tweeted: @profkeithdevlin

Wuzzit Trouble was named the most important educational game of 2013 by Develop-Online. http://t.co/9elMJzc5sp

2014-04-18 11:51:55

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