[vimeo url=http://vimeo.com/37796909]
Look at the fluid dynamics!
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- In @christianp’s office ahead of Newcastle #MathsJam – @peterrowlett
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- Manchester: A puzzle from Lewis Caroll: draw this shape without retracing or lifting your pen. Now, write a program that draws it in LOGO!
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- Manchester: Paul explains a cake slicing puzzle.
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- Manchester: Andrew has invented a game to keep all the MathsJams occupied for the foreseeable future.
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- Newcastle: David’s almost Collatz game.
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- Newcastle: @peterrowlett playing @christianp at Mad Abel card game.
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- Newcastle: playing pool on a torus. Next up: Klein bottle.
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- Newcastle: @peterrowlett has Newcastle MathsJam working out @Samuel_Hansen’s zero magic graphs
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- Manchester: Stellated icosahedron and depleted beverage vessels.
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- Newcastle: biggger noughts and crosses
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- Newcastle: Matthew trying to solve David’s almost-Collatz game
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- Manchester: Andrew’s final cartoon.
MathsJam March 2012 Photos
If you’ve taken a picture at a MathsJam and you’d like to share it, please submit it to our tumblr.
Interesting Esoterica Summation, volume 3
Summing up some more interesting esoterica seems like the right thing to do at the moment, so here’s that.
A reminder: every now and then I encounter a paper or a book or an article that grabs my interest but isn’t directly useful for anything. It might be about some niche sub-sub-subtopic I’ve never heard of, or it might talk about something old from a new angle, or it might just have a funny title. I put these things in my Interesting Esoterica collection on Mendeley.
In this post the titles are links to the original sources, and I try to add some interpretation or explanation of why I think each thing is interesting below the abstract.
Continue reading “Interesting Esoterica Summation, volume 3” on cp’s mathem-o-blog
Short, short sci fi #TBSFA
I’m not one for producing creative writing but yesterday, thanks to James Clare, I came across a fun idea: the BSFA Tweetfiction Tweetstream challenge. There are bunch of rules on the website but basically it’s an original piece of sci-fi or fantasy fiction contained within a tweet with the hashtag #TBSFA. Check out attempts by doing a Twitter search for #TBSFA.
I felt an attempt should be a contained, whole story (premise to resolution). The much Retweeted example is by @steven_moffat, current head writer of Doctor Who:
The worm became an idea, which hid itself in words, until it could climb, devouring all, through the eye of the reader of this tweet. #TBSFA
— Steven Moffat (@steven_moffat) April 6, 2012
This is good because something is set up (the worm that became an idea and hid in words) and happens (it climbs through the eye of the reader) within the tweet. Even though you don’t know where the worm came from or what results from it being in your eye, I feel that this has structure. Some of the tweets I’ve seen are more like snippets. Many are making creative use of language but they lack either the establishment of a premise or its resolution, or sometimes both. I don’t want to pick on a particular example so I’ve made one up:
The monster was only inches away as I cowered. I needed to run away but somehow I couldn’t make my legs start working again. #TBSFA
You don’t know what the scenario is, where the monster came from, or what happened in the end. Crucially, nothing happens. Perhaps it’s fun to fill in these details (arbitrarily) yourself but I think then the story hasn’t really done its job. A really good example, in my view, is this that I saw this morning by @mjkirkham:
As the soldiers were kicking down my door, I clicked ‘Unlike’ on the Emperor’s profile page. Rebellion felt good. :) #TBSFA
— Mark Kirkham (@mjkirkham) April 7, 2012
In a few short words this conjures a world, an event happening within it and makes something happen. So much is evoked that isn’t said. We imagine an Orwellian society with extreme, state-controlled social networking. Our hero has disobeyed, been caught and now manages one final act of rebellion before being taken away by the state. In a few short words, you are led to invent an entire story.
Given that the medium was Twitter, I felt acknowledging this by writing a piece of Twitter dialogue was appropriate. You may be aware of the process of commenting on a Retweet (RT, to tweet again someone’s message, with attribution). There are various methods for this but I favour putting a comment in front of the RT, so this would look like this: “Message in reply RT @firstuser Original message”. Although this means the tweet needs reading backwards it removes any ambiguity over who said which portion. Because of the need to have a complete story I decided to structure a three stage tweet: “First user responds to query RT @seconduser Second user queries original message RT @firstuser Original message”.
Anyway, here is my attempt:
Said he was fed up of people asking RT @tim Did he really have a proof? RT @peterrowlett 1st trip in new time machine, to meet Fermat #TBSFA
— Peter Rowlett (@peterrowlett) April 6, 2012
With such a small number of characters in which to tell a story it seemed sensible to appeal to a cliche or two. I tried to hint at a world in which time travel is commonplace (the first tweet reports getting a “new time machine”, not inventing one, and ‘@tim’* doesn’t seem surprised), and consequently history is overloaded with time travellers (Fermat is tired of the question yet his Last Theorem wasn’t known until after his death, when it was discovered by his son in the margin of his copy of Diophantus’ Arithmetica; he must, therefore, be being bothered by visitors from the future), with the implication of consequent issues for causality.
I chose the issue of whether Fermat actually had a proof, or simply felt he saw one and didn’t check the details, as a suitably unanswerable question. (Given that Fermat’s conjecture is correct,) Without travelling back in time and asking Fermat to write out the details of his proof (how do you broach that question without breaking causality?), we cannot really know the answer.
I like this idea of having such a short space to bring forth an idea. I hope you like my attempt. I encourage you to have a go. (You’re supposed to do it by midnight Tuesday to enter a competition, but perhaps it would be fun anyway!)
* I didn’t realise until after I’d sent my tweet that there is actually a user @tim! I meant to check and forgot. I just wanted a short name so it didn’t take too many characters, and there’s a whole tim-time thing. Thankfully @tim’s most recent tweet says he is logging off Twitter for a month, and he has so many followers hopefully he won’t see and be confused by my apparently putting words in his mouth!
Origami Tessellations by Eric Gjerde
Origami Tessellations by Eric Gjerde:
Carnival of Mathematics 85
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| 85 by brighterorange |
Introduction
Welcome to a new Carnival of Mathematics! Traditionally the Carnival opens with facts about the number, this time 85, but first I have an important point of admin to address.
From Carnival of Mathematics 59 in November 2009 until Carnival of Mathematics 84 in December 2011, the Carnival was coordinated by Mike Croucher. Mike said in a blog post (of course!) that he had “had a lot of fun doing so” but that: “Recently, however, I have struggled to find the time to give the CoM the attention it deserves and so it is time to hand over the baton.” We should all be very grateful to Mike for his effort over these two years. You can still find Mike blogging over at Walking Randomly.
Now, as a result, the Carnival has a new home (including an index of previous Carnivals) at The Aperiodical, a not-quite-yet-formally-announced blogging collaboration between Katie Steckles, Christian Perfect and me. We’ll do our best to look after the series for the time being. If you’ve been following the Carnival for a while you’ll know it only works because of a parade of volunteer hosts. The next few Carnivals are lined up but if you’d like to volunteer to host one on your blog later in the year please contact Katie. The other necessary element is submissions, and we have plenty of these this time, so let’s get to business.
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| Funky new Carnival logo by Katie Steckles |
85
This is Carnival of Mathematics 85. The ever-faithful Number Gossip tells me that 85 has no unique or even rare properties, being merely composite, deficient, evil, odd, square-free and a Smith number. Beyond mathematics, Wikipedia tells me that 85 is the atomic number of astatine, the ISBN Group Identifier for books published in Brazil and the lower bound (due to incomplete research) found by Jorge Stolfi (2004) for The Hollywood Constant, the smallest non-negative integer that has never been used in the title of a movie.
Serious mathematics
(Not that the rest isn’t!)
Brent Yorgey at The Math Less Traveled wrote a series of four posts in response to Depressing Expressions by Patrick Vennebush over at Math Jokes 4 Mathy Folks. In these, he is working to prove why a certain iterative arithmetic algorithm always results in a factorial. Brent says:
In particular I’m proving it using a *combinatorial* proof, a lovely proof technique that (in my opinion) isn’t used or taught as widely as it ought.
In part four Making Our Equation Count, he says,
I go through the different bits of the equation we’re trying to prove, and explain (with pictures) how to interpret each of them combinatorially.
Rebecka Peterson at Epsilon-Delta writes Extraneous Solutions of Log Equations–A Graphical Explanation. In submitting this post, Rebecka wrote:
Last semester a College Algebra student of mine asked why we sometimes get extraneous solutions when solving log equations. It was such a good question. I tried to do it justice in this post.
Drawing inspiration from the award of the Leroy P. Steele Prize for Mathematical Exposition to Aschbacher, Lyons, Smith, and Solomon for a work about the classification of finite simple groups, Gianluigi Filippelli at Doc Madhattan offers a post about finite simple groups and connections with physics in The classification of finite simple groups.
Frederick Koh from White Group Mathematics submitted Understanding MATTERS (4) saying:
Of late I noticed quite a few students (in online forums) experiencing difficulties in comprehending the concept of calculating distances between 3 dimensional vector planes in space, hence I am sharing an in depth explanation behind how things work.
Rohit Gupta at Kali & the Kaleidoscope investigates a new visualization of Möbius’ Mu, “a notorious function to classify all integers in three different boxes” in The 3 Pills of Möbius.
Art
Thomas Egense from Thomas’ mathematical adventures writes about an attempt to create mathematics-inspired art algorithmically using something called “Fractal flames”. Thomas defines fractal flames, details the algorithmic work involved, and gives several examples of the generated artwork, including the image below (used with permission).
Thomas Egense also submitted Dimensions (series of nine videos embedded below) calling this an “impressive graphical visualization of hard to grasp mathematical concepts like higher dimensions and topology”.
Last week Gathering for Gardner 10, the meeting of mathematicians, magicians, puzzlers and others inspired by the life and work of Martin Gardner, took place. Edmund Harriss, from Maxwell’s Demon, previewed his G4G10 talk in a blog post, The 2×1 rectangle and Domes. Edmund begins with the humble 2×1 rectangle, “not one of mathematics most celebrated shapes”, and ends up with structures built as accommodation at the Burning Man event.
Pop culture
Matt over at Math Goes Pop! writes in The Probability Games about the process used to select participants to take part in a fight to the death in the book and film The Hunger Games. Matt says “the rules here practically beg for some mathematical analysis” and Katie Steckles, who submitted the post, called this “just the kind of unnecessary mathematical analysis of a situation I like to see”.
Video game mathematics
Drawing inspiration from the recent arXiv preprint Classic Nintendo Games are (NP-)Hard bringing video games “out of nerdy obscurity and into cutting edge computer science”, Sam Alexander from Xamuel.com writes Toward the Mathematics of Video Game Glitches. Sam noticed a minor error in that article based on a glitch in Super Mario Brothers. Running with this theme, he defines video game glitches, game theoretically speaking, and focusing on “glitches which the player can exploit to win the game faster than intended”, defines a theorem (which he describes as “committing horrendous crimes against mathematics”!).
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| SNES vs. Xbox Triple60 by avail |
Performance and puzzles
Ben Nuttall writes about his experience as a maths busker.
“What is Maths Busking?” I hear you ask. Maths Busking is a street performance of mathematics whereby the buskers demonstrate mathematical ideas and engage the public in thinking like a mathematician
As well as a fuller explanation of maths busking, Ben shares some of the ‘busks’ he performed, his thoughts on the experience and some photos.
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| Birmingham City Centre by Maths Busking |
Katie Steckles, writing at The Aperiodical, discusses a variant of a popular mathematics ‘mind reading’ trick. I don’t want to spoil the puzzle in case you want to play along at home, so go over and check out On Disreputable Numbers.
Paul Taylor, also at The Aperiodical, writes about a puzzle he designed for Katie Steckles’ Puzzlebomb. Puzzlebomb is a monthly puzzle sheet featuring all-new types of puzzles. Following the release of the April Puzzlebomb, Paul made the following claim on Twitter:
I guarantee there has never been, and will never be, another puzzle quite like Hilbert’s Space Filling Crossword
In Words to Fill Space he justifies this assertion and describes how he created the puzzle.
Paul also writes, again at The Aperiodical, about a class of puzzle in which a number of prisoners are all given hats and their fate depends on their ability to correctly determine the colour of their own hat. Paul offers “a nice variation on the theme that I heard about at a recent MathsJam” as Another black and white hats puzzle.
Maths Jam is a monthly meeting of maths enthusiasts in pubs worldwide to share stuff they like. “Puzzles, games, problems, or just anything they think is cool or interesting“. A recent development is blogging roundups of what happened at Maths Jam meetings. Recent outings, full of puzzles and mathematical goodies, include: Newcastle (February), Manchester (March), London (February) and Melbourne (January), and a set of photos from various February Maths Jam meetings.
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| Maths Jam London February 2012 |
Last month I attended Newcastle Maths Jam. While there we played with a puzzle that Out of the Norm states as:
By relabelling the faces of two dice, can you design a new, unusual pair of six-sided dice that achieves rolls with the same frequencies as a pair of normal dice? All the faces must have a positive number of spots.
Dice and Dissection: a puzzle discusses this puzzle and gives a nice diagrammatic way to view the solution.
History and society
John Cook of The Endeavour writes about a wedding invitation written under the collective pseudonym of that “semi-secret group of French mathematicians”, Nicolas Bourbaki. In Nicolas Bourbaki’s wedding invitation, John explains some of the mathematical references and reveals how the invitation “nearly cost Bourbaki member André Weil his life”.
A post on Pat’sBlog goes to primary sources to highlight an error in Wikipedia in relation to the origins of the four-fours problem. That is,
using four fours and whatever mathematical operations that were allowed to make a number, or a set of numbers.
The origins of the problem apparently lie in earlier similar problems, including a problem of four threes. Read about it in Before There Were Four-Fours, There Were Four-Threes.
Guillermo Bautista at Mathematics and Multimedia writes A US President’s Proof of the Pythagorean Theorem about the proof of the Pythagorean theorem formulated by James Garfield, the 20th president of the United States of America.
Alexander Bogomolny of CTK Insights offers a little piece of mathematics in the history of chronology given in Florian Diacu’s The Lost Millennium in a post entitled Chinese Remainder Theorem: an Application to Chronology. Submitting this post, Alexander said:
Chinese Remainder Theorem is a staple of early puzzle books, both European and Eastern. This is very satisfying to learn that the theorem finds practical and important applications in the science of chronology. The book by Florian Diacu where I found this application is an exquisitely written compendium of history and mathematics of calendrical calculations. The book deserves every praise and gets my wholehearted recommendation.
In a blog post here on Travels in a Mathematical World, I was very taken with an answer given to a question about working outside traditional academia by Neil deGrasse Tyson in an interview with Samuel Hansen for the Strongly Connected Components Podcast episode 45. The whole interview (18 mins) is worth listening to. My reflections can be found as Culturally an academic.
Over at Second-Rate Minds, Samuel Hansen writes about The True Importance of Friends, explaining the origin of a result in social network theory and its implications in epidemiology.
I really noticed the absence of the Carnival back in February when I thought I might submit a couple of blog posts which got a particularly warm reaction and found the submissions form deactivated. The posts were Apparently Gauss got in this bar fight with Hilbert… and the follow-up Why do we enjoy maths history misconceptions?
Technology
John Chase from Random Walks writes about the surprising features of Microsoft Office Equation Editor, in which he makes the bold claim: “LaTeX lovers will love it”. Find out why at Microsoft Office Equation Editor.
I’ve saved the last word for this revived Carnival to the previous coordinator, Mike Croucher. Mike’s month of math software for March 2012 offers the latest news in the world of mathematical software (a month of math software has been a monthly series since January 2011).
The End
Well, that’s that for this Carnival. You can help spread the word by blogging, tweeting, etc. about the revival of the Carnival and directing people to this edition. If you’re hungry for more mathematics blog posts then there’s the previous Carnival of Mathematics 84, the latest Math Teachers At Play Carnival 48 is over at Math Is Not A Four Letter Word and you can get a weekly selection of blog posts from the Mathblogging.org Weekly Picks.
Future outings for the Carnival of Mathematics are queued over at The Aperiodical. Carnival of Mathematics 86 will be posted in May by Brent at The Math Less Travelled. Submissions for this are now open, so keep your eye out for great posts and get writing!
April Fools on the arXiv
Here’s a post on Metafilter about papers posted to the arXiv on April Fools’ Day. They’re all from the physics section, but a couple are of the basically-maths sort of physics.
I had a look at the maths section for any papers with bizarre titles published on the 1st of April but I couldn’t find anything. A missed opportunity!
I did find a computer science paper with the title “Worst-Case Robust Multiuser Transmit Beamforming Using Semidefinite Relaxation: Duality and Implications,” which looked to me like something produced by a Markov chain paper title generator but it seems to be a serious paper about something or other.