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10:04 AM | Desmos + Math

I was really blown away with Desmos. They just keep getting better. I found out this week they have apps now for i0S and Android and let you upload pictures. I was trying to figure out the parabola of my smile here. I uploaded my headshot and used a slider to play with [...]

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8:19 AM | How not to be ignorant about the world

Recurring TED talker Hans Rosling returns with his son and Gapminder Foundation co-founder Ola Rosling and an update on their …Tags: Gapminder, Hans Rosling, health

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curiosamathematica:
Repeated barycentric subdivision results in a gorgeous fractal-ish pattern.

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6:57 PM | Awefull

Images by Jordan Bettcher (Dream--Awake)
http://im-possible.info/english/art/pencil/jordan-bettcher.html
Author - http://dream--awake.deviantart.com/

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4:00 PM | Latitude and the Drought

Using California's range of latitude for a color coded plot the severity of its drought over time, via xkcd.

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In high school health class, where I learned about contraceptives and the dangers of pre-marital sex, my teacher spouted rates …Tags: birth control, New York Times

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1:00 AM | Prüfer 2-group

This is the Prüfer $2$-group, the subgroup of the unit complex numbers consisting of all $2^n$th roots of unity. It is also called $\mathbb{Z}(2^\infty)$.

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6:55 PM | Enamel works by Mikhail Mantulin

Enamel works with impossible figures by Mikhail Mantulin
http://im-possible.info/english/art/applied_art/mikhail-mantulin.html

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allofthemath:
mathed-potatoes:
When people ask me how I can be a math major and still say I’m not good with numbers, I’m like ‘here, let me draw you a picture.’
All so true.
^For those that are considering majoring in math but are deterred by their lack of number skills, there’s definitely more to mathematics than simply numbers. (I’m not dissing stats or number theory or algebra though. Those are cool too!)

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This took me a while to wrap my head around. Basically, the shapes are generated every time the faster one “passes” the slower one. In the first example, we had 13 and 8, so in one full cycle the faster one passes the slower one 5 times. Each time, it generates a cardioid. Cardioid are epicycloids, as seen here.
Since each pass will occur in an identical amount of time, we end up with rotational symmetry. Forgive my poor drawing skills:
It’s easy to miss the fact that they are
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“You should not trust functions whose derivative is unbounded!” - Real analysis professor (via mathprofessorquotes)

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11:35 AM | Teaching math through percussive dance

Malke Rosenfeld uses percussive dance to teach math to her elementary students. The program is called Math in Your Feet. …Tags: education, math, teaching

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10:00 AM | Extinctions and animal species at risk

Data journalist Anna Flagg for ProPublica reported on animal species at higher risk of extinction. Animal species are going extinct …Tags: animals, extinction, ProPublica

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Take a rectangle, and cut it along a random line, then flip one of the pieces over to make a new shape. Repeating this gives a sequence of random shapes with an increasing number of corners. Note if your starting shape is a circle, it doesn’t change. [code]

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“Don’t date boys. You will get pregnant and die. Do calculus instead.” - High school calculus teacher (via mathprofessorquotes)

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matthen:
A roulette traced from rolling an ellipse inside a circle. [thanks] [code]

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dinosauradvocate:
proofmathisbeautiful posted this today: http://proofmathisbeautiful.tumblr.com/post/93404320217/ketchuprocket-all-the-other-humans-fucking
I felt the need to do the math out. m is the weight of the corner weights, M is the table’s weight, and L is the side length of the table. h is how far the table is from the ceiling, and theta is the shown angle. Theta seemed useless to me, so my final answer included the other variables. Now, if you want to do this with a specific
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I couldn't resist.Tags: featured, poster

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Dont really know much about this dude.. but i was on youtube looking for some social media tips and this guy’s face popped up!
Love it!
Here is the direct link to the youtube video! hope you enjoy it to!

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10:36 AM | A Truncated Story of Infinity

A Truncated Story of Infinity, a short film by Paul Trillo, explores the infinite possibilities in the mundane and everyday …Tags: infinity, short film

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9:23 AM | Math + Wobbly Tables

Think you will never use math in the real world? Check out this fix for a table with a bad case of the wobbles via LifeHacker.

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5:00 AM | Remembering 9-11 and a Long Walk Home

I've pretty much used up the math metaphors for the Twin Towers years ago, so I don't have another comic commemorating the event. Maybe next year. On the other hand, I do have something that I wrote a few years ago in another forum. People from around the country participated, and I was one of the "locals" to the Event there. My story is just one of the millions that could be told that day, and it's hardly one of the more frightening, nor one of bravery and heroism. It's just a first-hand […]

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A roulette traced from rolling an ellipse inside a circle. [thanks] [code]

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7:18 PM | Double tribar 4

Double tribar 4
by Andreas Aronsson
http://im-possible.info/english/art/computer/andreas-aronsson.html#double-tribar4

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4:21 PM | Generative book covers

The New York Public Library is developing an eBook-borrowing system, which includes an app that helps you keep track of …Tags: book covers, NYPL

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7:12 AM | Beat Blox

Beat Blox is a student project by Per Holmquist from Beckmans College of Design. Blocks are placed on a turntable, …Tags: beats, music

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5:00 AM | (x, why?) Mini: HOTS!

(Click on the comic if you can't see the full image.) (C)Copyright 2014, C. Burke.Should've thought that out more ... at a higher order.

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12:11 AM | The Book Bucket Challenge

ioanaiuliana21:
TheBookBucketChallenge is a great thing… And I thought that I should do it for you.. So here are (in no specific order) the books that influenced me, mathematical speaking… 1.’The elephant in the classroom : helping children learn and love maths’ by Jo Boaler2.’Alex’s Adventures in Numberland’ by Alex Bellos 3.’What Counts: How Every Brain is Hardwired for Math’ by Brian Butterworth4.’The Science of Secrecy - The secret history of codes and
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One of the exciting things in reading philosophy, its history in particular, is experiencing the tension between different schools of thought. This excitement turns to beauty if a clear synthesis emerges to reconcile the conflicting ideas. In the middle to late 18th century, as the Age of Enlightenment was giving way to the Romantic era, […]

Post, E.L. (1936). Finite combinatory processes -- formulation 1., Journal of Symbolic Logic, 1 (3) 103-105.

Citation

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In effetti questa è (o dovrebbe essere) la versione estesa di una conferenza di Philip K. Dick alla convention fantascientifica di Metz, in Francia, nel 1977. Non sono riuscito a trovare trascrizioni dell'intervento realmente fatto dallo scrittore a Metz, ma il video (via Open Culture) è abbastanza differente (non troppo rispetto ai contenuti) rispetto al testo (archive.org) successivamente pubblicato sulla Philip K. Dick Society Newsletter #27.Innanzitutto Dick esprime l'idea alla base di
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Susskind L. (1995). The world as a hologram, Journal of Mathematical Physics, 36 (11) 6377. DOI: http://dx.doi.org/10.1063/1.531249

Bousso R. (2002). The holographic principle, Reviews of Modern Physics, 74 (3) 825-874. DOI: http://dx.doi.org/10.1103/revmodphys.74.825

Bekenstein J. (2008). Bekenstein-Hawking entropy, Scholarpedia, 3 (10) 7375. DOI: http://dx.doi.org/10.4249/scholarpedia.7375

Citation

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In effetti questa è (o dovrebbe essere) la versione estesa di una conferenza di Philip K. Dick alla convention fantascientifica di Metz, in Francia, nel 1977. Non sono riuscito a trovare trascrizioni dell'intervento realmente fatto dallo scrittore a Metz, ma il video (via Open Culture) è abbastanza differente (non troppo rispetto ai contenuti) rispetto al testo (archive.org) successivamente pubblicato sulla Philip K. Dick Society Newsletter #27.Innanzitutto Dick esprime l'idea alla base di […]

Susskind L. (1995). The world as a hologram, Journal of Mathematical Physics, 36 (11) 6377. DOI: http://dx.doi.org/10.1063/1.531249

Bousso R. (2002). The holographic principle, Reviews of Modern Physics, 74 (3) 825-874. DOI: http://dx.doi.org/10.1103/revmodphys.74.825

Bekenstein J. (2008). Bekenstein-Hawking entropy, Scholarpedia, 3 (10) 7375. DOI: http://dx.doi.org/10.4249/scholarpedia.7375

Citation

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Bayesian Lasso $$\begin{align*} p(Y_{o}|\beta,\phi)&=N(Y_{o}|1\alpha+X_{o}\beta,\phi^{-1} I_{n{o}})\\ \pi(\beta_{i}|\phi,\tau_{i}^{2})&=N(\beta_{i}|0, \phi^{-1}\tau_{i}^{2})\\ \pi(\tau_{i}^{2})&=Exp \left( \frac{\lambda}{2} \right)\\ \pi(\phi)&\propto \phi^{-1}\\ \pi(\alpha)&\propto 1\\ \end{align*}$$ Marginalizing over \(\alpha\) equates to centering the observations and losing a degree of freedom and working with the centered \( Y_{o} \). Mixing
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Park, T. & Casella, G. (2008). The Bayesian Lasso, Journal of the American Statistical Association, 103 (482) 681-686. DOI: 10.1198/016214508000000337

Figueiredo M.A.T. (2003). Adaptive sparseness for supervised learning, IEEE Transactions on Pattern Analysis and Machine Intelligence, 25 (9) 1150-1159. DOI: http://dx.doi.org/10.1109/tpami.2003.1227989

Armagan A., Dunson D.B. & Lee J. GENERALIZED DOUBLE PARETO SHRINKAGE., Statistica Sinica, PMID: 24478567

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Trasmetto il seguente comunicato stampa, inviatomi dall'Università di Milano-Bicocca:Il cervello di musicisti professionisti, che hanno studiato approfonditamente uno strumento musicale ed hanno interiorizzato in modo raffinato il collegamento tra gesto e suono, risponde in maniera automatica all’incongruenza tra un gesto musicale ed il suono che viene prodotto, se l’abbinamento non è perfetto. Questo grazie ai neuroni specchio audiovisuomotori, la cui esistenza è
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Mado Proverbio, A., Calbi, M., Manfredi, M. & Zani, A. (2014). Audio-visuomotor processing in the Musician's brain: an ERP study on professional violinists and clarinetists, Scientific Reports, 4 DOI: 10.1038/srep05866

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srcav tweeted: @srcav

@icecolbeveridge @reflectivemaths who said "all models are wrong, but some are useful "?

2014-09-16 18:05:34

mathhombre tweeted: @mathhombre

RT @mpershan: Tonight at the @GlobalMathDept, we've got @cheesemonkeysf, @rdkpickle and many more talking about about group work. https://t…

2014-09-16 18:04:03

freakonometrics tweeted: @freakonometrics

"Faut-il fact-checker les journalistes?" http://t.co/EzqFHJOH5S (comment si la question méritait d'être posée)

2014-09-16 18:01:51

DrMathochist tweeted: @DrMathochist

RT @ChrisHallbeck: Is this scar from when you were in the military? Yes, they make the coffee very hot and the lids don’t fit very tight.

2014-09-16 17:56:37

DrMathochist tweeted: @DrMathochist

RT @pkedrosky: The @matt_levine model for hedge funds applies equally to venture capital. Smart stuff. http://t.co/fDQBFAkLgn http://t.co/u…

2014-09-16 17:55:09

mathhombre tweeted: @mathhombre

RT @Trianglemancsd: Also there is this for the #tgffest https://t.co/lk0oUUmYwA from our own @j_lanier

2014-09-16 17:52:06

MindAfterMath tweeted: @MindAfterMath

Examples of the Binary Search Algorithm http://t.co/Ry4liflatt #compsci #datascience #math #stem #mathchat

2014-09-16 17:47:10

ulaulaman tweeted: @ulaulaman

Il Torrente Epperò http://t.co/oDlwF2bM3f by @Popinga1

2014-09-16 17:41:54

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