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Posts

November 01, 2014

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1:00 AM | Packing Smoothed Octagons
Which shape is worst of all for packing the plane? That is, which has the lowest maximal packing density? Suppose we demand that our shape be convex and also centrally symmetric: that is, a subset $S \subseteq \mathbb{R}^2$ such that $x \in S$ implies $-x \in S$. Then a certain 'smoothed octagon' is conjectured to be the worst. Amazingly, this shape has a 1-parameter family of maximally dense packings, shown in this image created by Greg Egan.

October 31, 2014

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8:00 PM | Adrien-Marie Legendre
Portrait of the great mathematician Adrien-Marie Legendre, painted in 1820. Adrien-Marie Legendre (French pronunciation: ​[adʁiɛ̃ maʁi ləʒɑ̃ːdʁ]) (18 September 1752 – 10 January 1833) was a French mathematician. Legendre made numerous contributions to mathematics. Well-known and important concepts such as the Legendre polynomials and Legendre transformation are named after him. [...]
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7:43 PM | Without Haste
Without Haste (2003)  album cover of the Russian rock-group Voskresenie   http://im-possible.info/english/art/misc/cd/voskresenie.html
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5:18 PM | Monstrous Math Video
Having issues with the video? Try the audio-only feed using the player below! Susan Cantey is at it again!  This time she had help from her two granddaughters on creating this song! The song is a mathematical parody of "Monster Mash" by Bobby (Boris) Pickett You can find this on YouTube at youtu.be/ZSo0JcpffTk!If you like this song, be sure to find Susan Cantey's other works on Spotify, iTunes, and CD Baby! [...]
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3:58 PM | Happy Halloween!
We at Calculus Humor will like to wish everyone a happy and safe Halloween! [...]
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11:25 AM | Relative size of astronomy stuff
Look! More size of very big things with large numbers, compared against things that you're kind of familiar with. Does …Tags: astronomy, scale
Editor's Pick
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7:32 AM | Prostitution, GDP, and £1.7 billion due
David Spiegelhalter, professor of public understanding of risk, does some back-of-the-napkin math to describe why recent prostitution estimates for the …Tags: prostitution, taxes, uncertainty
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5:00 AM | Decomposing Numbers
(Click on the comic if you can't see the full image.) (C)Copyright 2014, C. Burke.They're decomposing numbers ... there's less of them every year ... Happy Halloween!
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1:01 AM | twocubes: anewkindofmagic: twocubes: aeneida: twocubes: cute...
twocubes: anewkindofmagic: twocubes: aeneida: twocubes: cute! I want to prove this but I don’t know where to start hint: I got in quite a mess of algebra when I did this. Curse the sum of squares formula and all its works. Alternate way I found: consider the pairs of squares on both sides , starting with the largest. Take the smaller from the bigger, and add these differences. We want to prove that this is equal to the square of n(2n+1). For instance, (14^2-12^2)+(13^2-11^2)=10^2. […]

October 30, 2014

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5:06 PM | Cover of Estado de Minas
Cover of Brazilian magazine Estado de Minas   http://im-possible.info/english/art/covers/magazine-estado-de-minas.html
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10:21 AM | Decline of women in computer science
NPR spent some time on the subject of the decline of women in computer science. Whereas the the percentage of …Tags: computer science, gender, NPR
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7:32 AM | Chess piece survival rates
On Quora, someone asked, "What are the chances of survival of individual chess pieces in average games?" Oliver Brennan answered …Tags: chess, survival rate
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5:00 AM | Math Horror Movies: The Strange Case of ...
(Click on the comic if you can't see the full image.) (C)Copyright 2014, C. Burke.Secant you will find what Man was Not Meant to Know.

October 29, 2014

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7:34 PM | Chain
Chain   by Andreas Aronsson   http://im-possible.info/english/art/computer/andreas-aronsson.html#chain
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7:01 PM | Statistically ignorant
Ipsos MORI, primarily a marketing research group I think, released results of their study on public perception of demographics versus …Tags: ignorance, world
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1:31 PM | Is It Too Late?
Is it too late for me to go back to elementary school? [...]
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10:01 AM | Halloween costume rankings
Accompanying their segment on Halloween stores stocking costumes, NPR ranks bestsellers for the past four years, based on data from …Tags: costume, Halloween, ranking
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9:05 AM | Breakout detection in R
Say you have time series data and you want to detect significant changes, but there's also a lot of noise …Tags: changes, time series, Twitter
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5:00 AM | Math Horror Movies: Little Shape
(Click on the comic if you can't see the full image.) (C)Copyright 2014, C. Burke.You don't meet nice shapes on Skid Row. Don't feed the plant! Plus a Constant.
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12:42 AM | Photo
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12:42 AM | Photo
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12:42 AM | Photo
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12:29 AM | mathematica: iwasateenagefaery: joanne-and-deans-bacon: I’M...
mathematica: iwasateenagefaery: joanne-and-deans-bacon: I’M SAVING THESE TO FUCK WITH PEOPLE’S BRAINS I just love the boy’s reactions i keep imagining a little boy screaming bedtime paradox and then immediately falling to sleep I see you, Bertrand Russell.

October 28, 2014

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9:09 PM | Reddit AMA happening now here https://twitter.com/jamesgrime/status/527204677050703872
Reddit AMA happening now here https://twitter.com/jamesgrime/status/527204677050703872
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7:08 PM | Roots and Branches
Roots and Branches   by Vlad Alexeev   http://im-possible.info/english/art/computer/vlad.html#roots-and-branches
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4:45 PM | Hey, apparently I’ll be doing one of those Reddit Ask Me Anythings at 9pm GMT (5pm ET)....
Hey, apparently I’ll be doing one of those Reddit Ask Me Anythings at 9pm GMT (5pm ET). I’ll try and provide a link later.
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7:50 AM | Neurons conversing
Adam Cohen and his group are using genetically-modified neurons that light up when the cells activate to see the communication …Tags: brain, New Scientist
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7:11 AM | Affordable Care Act progress report
The New York Times takes a data-centric look at the progress of the Affordable Health Care Act here in the …Tags: health care, New York Times
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5:00 AM | Math Horror Movies: Attack!
(Click on the comic if you can't see the full image.) (C)Copyright 2014, C. Burke.It's got a Killer soundtrack and high Rotten Tomatoes score!
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12:02 AM | 1ucasvb: Affine transformations preserve parallel lines, and...
1ucasvb: Affine transformations preserve parallel lines, and include rotations, scaling, shears and translations. Linear transformations can’t perform translations, but this can be achieved if we go to a higher dimension. In this animation, a planar (2D) shape lying on the plane z = 1 is translated by means of a linear transformation in three dimensions: a shear along the z axis. Rotations can be performed normally, also around the z axis. For rotations around any other axis parallel to […]
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6,267 Results