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1:25 AM | Thanks for Additivity

A mathematical metaphor for progress Cropped from source Nicole Oresme was a fourteenth-century polymath. He lived in France and became an advisor to King Charles V, who sponsored him to translate many works by Aristotle into French as well as Latin. He then became bishop of Liseux until his death in 1382. Oresme made original […]

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12:00 AM | On This Day in Math - November 28

Newton is, of course, the greatest of all Cambridge professors; he also happens to be the greatest disaster that ever befell not merely Cambridge mathematics in particular, but British mathematical science as a whole.~Leonard RothThe 332nd day of the year; 332 is the number of ways to partition 47 into non-zero triangular numbers. (36 + 10 + 1 would be one)The sum of the first 332 primes is a prime.As numbers get larger and larger, it would seem that there would be fewer and fewer […]

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11:19 PM | Automating Greenhouse Irrigation

We’re installing robotic sprinklers in the school’s greenhouse! And this post details the project to date. Step 1: What physics can we do in the greenhouse? Last spring, when our garden manager Emily approached me about creating a project that brought together her garden and my physics classes, I was interested. “What does the greenhouse need?” I […]

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11:19 PM | Definite Integral Approximations

This worksheet is intended to help the student compare and contrast the various methods for approximating or calculating definite integrals.
From mistermathguy GeoGebra Stuff

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11:15 PM | superintelligence [book review]

“The first ultraintelligent machine is the last invention that man need ever make, provided that the machine is docile enough to tell us how to keep it under control.” I.J. Good I saw the nice cover of Superintelligence: paths, dangers, strategies by Nick Bostrom [owling at me!] at the OUP booth at JSM this summer—nice […]

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11:14 PM | Simple Harmonic Motion - Pendulum

Simple Harmonic Motion as displayed through the swinging of a pendulum.
From mistermathguy GeoGebra Stuff

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11:09 PM | The warmest November

I've been playing with a lot of temperature data lately: you can see a short Python analysis of temperatures over at my personal blog. At work (at the University of Minnesota) I'm working with some masters' students on research into … Continue reading →

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11:08 PM | Simple Harmonic Motion - Ferris Wheel

Simple Harmonic Motion as displayed through the motion of a Ferris wheel.
From mistermathguy GeoGebra Stuff

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10:55 PM | Counting the Hours

From data obtained by the American Time Use Survey, this site has created a series of graphs. The distributions of time use for various activities across the day are interesting. When talking about positive and negative skew, it's sometimes hard to find a 'real-life' example that students will relate to. However, this data capture skewed distributions from data students will be familiar with.

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A new set of Lecture notes is available here. These ones are about group testing and contain a very brief “crash-course” on error-correction codes. They also include five open problems. As usual, I will document the open problems here, while referring a much more detailed description of the problems on the notes. Open Problem 7.1. (Group testing bounds) Given and … Continue reading 18.S096: Group Testing and Error-Correcting Codes →

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9:57 PM | Exchanging Math for Fake Internet Points

As a fourth-year grad student in math at the University of Minnesota, I spend a lot of time thinking about math problems, but I get worn out when I think about the same problem for too long. Sometimes it can … Continue reading →

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8:21 PM | Impossible Cube Pendant

Impossible Cube Pendant
by Joshua Stockwell
http://im-possible.info/english/art/applied_art/joshua-stockwell.html
Author - https://www.etsy.com/ru/shop/AuInspiredDesign

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8:05 PM | his bright materials

seven signs in seven positions. PALEGAS and MRBGPYO (aka ROYGBIV) and days-of-the-week and ages-of- -man and whatnot… the trivium & quadrivium… may be superimposed in various interesting ways. the seven principles of UU will eventually be invoked if this is ever (again) the basis of a sermon by me. “window crayons” on cardboard box; 2015. […]

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8:01 PM | What Are You Thankful For?

This time of year always has me thinking- typically not about what it represents, how it originated, or how it should be changed- but about how I have done over the past year in Giving Thanks. I can’t begin to describe how much I have grown this past year: how many great ideas have been […]

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7:21 PM | Low Floor and High Ceiling Math

Whether you like to solve problems yourself, or are looking for some tidbits for your children or students, I hope this post is informative. I’ve been reading Jo Boaler‘s brilliant new book, Mathematical Mindsets. While there’s tons of great information … Continue reading →

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7:21 PM | Time for Jokes

* * * —Mike, here are 10 chocolates. Give half of them to your brother. —OK. I’ll give him three chocolates. —You can’t count? —I can, but he can’t. * * * —How is your progress? —50%. —Done or left to do? * * * —Q: What did Al Gore play on his guitar? —A: […]

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6:24 PM | Do Your Own Thing

In grad school, I’ve noticed that some people can actually get bored of math! How does this happen?! I believe it often happens by not doing your own thing. Doing your own thing means pursuing problems that interest you, and learning whatever things that strike your fancy. It also means keeping your train of thought […]

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6:00 PM | MaBloWriMo 26: Left cosets

Let be a group and a subgroup of . Then for each element we can define a left coset of by . That is, is the set we get by combining (on the left) with every element of . For … Continue reading →

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5:48 PM | Relative Entropy in Biological Systems

Here’s a draft of my paper for the proceedings of a workshop on Information and Entropy in Biological System this spring: • John Baez, Relative Entropy in Biological Systems. I’d love any comments or questions you might have. I’m not happy with the title. In the paper I advocate using the term ‘relative information’ instead […]

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Today's entire class was devoted to factoring with algebra tiles. My students had two pages of expressions to factor and they did a really good job.In some cases they ran out of the right colour tile, so they improved instead of getting another set.Here's a difference of squares:The goal today was to begin noticing some patterns emerging. We will talk about those on Monday.Here is today's homework.

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4:55 PM | borromean guitars

three newish guitar-stands arranged in such a way that any two will fall down without the third. and madeline’s “three women” statue, having a similar property. blessings from our happy home to yours if you’ve got one; double blessings if you’re doing without. happy “black friday”. the linking and not-linking rings (blogpost of 05/03/014). w’edia. […]

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A paper suggesting that exposure to sunlight might help prevent hip fractures in the elderly has been retracted, due to duplication and “concerns about the underlying data.” An expression of concern that appeared last July flagged the 2005 paper as containing text that matched another paper with the same first author that was published in 2011. According […]
The post Osteoporosis paper felled by concerns with “scientific integrity” appeared first on Retraction
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Automatticians, the people who build WordPress.com, participate in events and projects around the world every day. Periodically, they report back on the exciting things they do when not in front of a computer. Last week, Happiness Engineers Marjorie R. Asturias and Andrea Badgley attended the fifth annual Wine Tourism Conference …

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3:41 PM | Edublog Awards 2015

It’s coming up to the Christmas and new year period, and nominations have opened for the Edublog Awards 2015. The last few years I have written a post to nominate some of the blogs I enjoy most, and here I will list my nominations for this year. I hope you check out the blogs and […]

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3:33 PM | Slides and Videos: Randomized Numerical Linear Algebra reading group, Berkeley, Spring 2015

Laura Grigori co-organized with Jim Demmel, Ming Gu, Michael Mahoney, the Randomized Numerical Linear Algebra reading group at Berkeley this past spring. Here are the slides and videos of the presentations that occured then. From her page: From Michael Mahoney's presentationArchived video of the lectures may be seen here Feb 17 - M. Mahoney: Randomized Algorithms for Matrices and Data, slides Feb 24 - J. Demmel: notes of the lecture , video of the lecture Mar 3
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Two postdocs positions are available at the Computer Science Institute ofCharles University in Prague. The position are supported by the EuropeanResearch Council (ERC) Consolidator Grant LBCAD: "Lower bounds forcombinatorial algorithms and dynamic problems" held by Michal Koucky. Thegoal of the project is to provide lower bounds on the complexity ofalgorithmic problems in various settings.The candidates should have strong background in computational complexity,algorithms or data
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3:03 PM | The Birthday “Paradox”

I asked the kids what they’d like to do for a math project today and my younger said that he’d like to do something birthday related. Well, that’s easy :) In the first part of the project I introduced them to the famous Birthday Paradox and asked them what they thought the answer was. The…

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2:37 PM | in memoriam

Filed under: Kids, pictures, Travel, Wines Tagged: 13 Novembre 2015, France, Paris

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A PLOS One paper on morphine treatment for cancer cells has a couple issues with figures, prompting a massive correction — what we affectionately call a “mega-correction” — by the journal. In one figure, there was “an undisclosed splice.” Another figure contained two panels that were “mistakenly from the same sample.” The 2013 paper in question, […]
The post Cropped, spliced image leads to a PLOS One correction appeared first on Retraction
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di diffusione della scienza e rivoluzioni cc @aubreymcfato @CristianCantoro Utilizzare i dati sulle citazioni in Wikipedia per misurare la diffusione dell'open accessScrivevo all'inizio del 2011 per i festeggiamenti del wiki-decennale di una rivoluzione irreversibile. E' stato piuttosto interessante leggere il titolo che technology review ha utilizzato per raccontare dell'ultimo degli articoli dedicati all'enciclopedia libera: Why Wikipedia + Open Access = Revolution.L'idea degli autori, Misha
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Nielsen, F. (2007). Scientific citations in Wikipedia, First Monday, 12 (8) DOI: 10.5210/fm.v12i8.1997

Heather Ford, Shilad Sen, David R. Musicant & Nathaniel Miller (2013). Getting to the source: where does Wikipedia get its information from?, Proceedings of the 9th International Symposium on Open Collaboration, DOI: 10.1145/2491055.2491064

Misha Teplitskiy, Grace Lu & Eamon Duede (2015). Amplifying the Impact of Open Access: Wikipedia and the Diffusion of Science, Wikipedia Workshop at 9th International Conference on Web and Social Media (ICWSM), arXiv: 1506.07608v1

Citation

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After (or before?) @StartsWithABang's balloon animals' post? A couple of week ago Ethan Siegel published a post about ballon animals, so I decide to repost an old piece that I wrote in 2011 for my italian blog: the english version is lost, but it is magically reposted here! Two one-balloon constructions and their associated graphsI recently discovered this interesting site, vihart. In the site there are some interesting paper and today I want to write something about Computational Balloon
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Demaine E.D., Demaine M.L. & Hart V. (2008). Computational balloon twisting: The theory of balloon polyhedra., Proceedings of the 20th Canadian Conference on Computational Geometry (CCCG2008), 139-142.

Bryś K. & Lonc Z. (2009). Polynomial cases of graph decomposition: A complete solution of Holyer's problem, Discrete Mathematics, 309 (6) 1294-1326. DOI: 10.1016/j.disc.2008.01.054

Citation

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Supponiamo di doverci confrontare con un animale, ad esempio un cane o un lupo (o più in generale con un animale, addomesticato o selvaggio). Secondo Konrad Lorenz il comportamento aggressivo di un cane viene influenzato da due stati d'animo differenti: l'ira e la paura.Si può allora provare a prevedere il comportamento del cane in funzione di quale dei due stati domina: nel caso in cui l'animale è dominato da paura o da ira, proporre una previsione è abbastanza semplice; nel caso in cui il […]

Zeeman E.C. (1976). Catastrophe Theory, Scientific American, 234 65-83. DOI: 10.1038/scientificamerican0476-65

Jean Petitot (2013). Complexity and self-organization in Turing, The Legacy of A.M. Turing, (E. Agazzi, ed.), Franco Angeli, Milano, 149-182. arXiv: 1502.05328v1

Citation

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Non prevedevo di scrivere la versione italiana di un post sull'ultima news proveniente dal RHIC, ma mi è stato gentilmente chiesto, e provvedo ben volentieri. Inizio, però, con un piccolo cappello, alla fine del quale saprete che c'è anche un piccolissimo pezzetto (il doppio diminutivo è perché i firmatari del papero su arXiv sono veramente tanti) d'Italia in questa interessante scoperta.Tutto nasce da un post, nel flusso twittero, di Annalisa Arci, in cui racconta, in maniera e con un […]

Belavina A.A., Polyakova A.M., Schwartza A.S. & Tyupkina Y.S. (1975). Pseudoparticle solutions of the Yang-Mills equations, Physics Letters B, 59 (1) 85-87. DOI: 10.1016/0370-2693(75)90163-X

Hooft G.'. (1976). Symmetry Breaking through Bell-Jackiw Anomalies, Physical Review Letters, 37 (8) DOI: 10.1103/PhysRevLett.37.8

Hooft G.'. (1976). Computation of the quantum effects due to a four-dimensional pseudoparticle, Physical Review D, 14 DOI: 10.1103/PhysRevD.14.3432

Fukushima K., Kharzeev D.E. & Warringa H.J. (2008). The Chiral Magnetic Effect, Physics Review D, 78 (7) DOI: 10.1103/PhysRevD.78.074033

Kharzeev D.E. & Yee H.U. (2011). Chiral Magnetic Wave, Physical Review D, 83 DOI: 10.1103/PhysRevD.83.085007

STAR Collaboration (2015). Observation of charge asymmetry dependence of pion elliptic flow and the possible chiral magnetic wave in heavy-ion collisions, arXiv, arXiv: 1504.02175v2

Citation

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A new clue about the #quarkgluonplasma from @RHIC_STAR at @BrookhavenLabWithin the particles that constitute atomic nuclei, protons and neutrons, there are the quarks, the elementary particles with fractional charges, linked to each other thanks to the gluons, bosons that carry the nuclear interaction. Thanks to the gluons it is impossible to observe, at present, free quarks, but it is expected that in the very first stage of the universe, matter was in a state called quark-gluon plasma. Thanks […]

Belavina A.A., Polyakova A.M., Schwartza A.S. & Tyupkina Y.S. (1975). Pseudoparticle solutions of the Yang-Mills equations, Physics Letters B, 59 (1) 85-87. DOI: 10.1016/0370-2693(75)90163-X

Hooft G.'. (1976). Symmetry Breaking through Bell-Jackiw Anomalies, Physical Review Letters, 37 (8) DOI: 10.1103/PhysRevLett.37.8

Hooft G.'. (1976). Computation of the quantum effects due to a four-dimensional pseudoparticle, Physical Review D, 14 DOI: 10.1103/PhysRevD.14.3432

Fukushima K., Kharzeev D.E. & Warringa H.J. (2008). The Chiral Magnetic Effect, Physics Review D, 78 (7) DOI: 10.1103/PhysRevD.78.074033

Kharzeev D.E. & Yee H.U. (2011). Chiral Magnetic Wave, Physical Review D, 83 DOI: 10.1103/PhysRevD.83.085007

STAR Collaboration (2015). Observation of charge asymmetry dependence of pion elliptic flow and the possible chiral magnetic wave in heavy-ion collisions, arXiv: 1504.02175v2

Citation

MathFour tweeted: @MathFour

Thanks to my top interactors! @MindofaDiva @skrachit @NoelineL @btizzypwd #tweetjukebox via https://t.co/LujIG0HnGL

2015-11-28 08:13:49

christianp tweeted: @christianp

Over a year without an update to https://t.co/vWVGIDB3KD. This is almost as sad as when memepool faded away.

2015-11-28 07:52:03

MindAfterMath tweeted: @MindAfterMath

Term Frequency Inverse Document Frequency https://t.co/WsP1JhkMT1 #compsci #datascience #math #stem #mathchat

2015-11-28 07:43:34

rmathematicus tweeted: @rmathematicus

RT @HistoryExtra: The origins of our love for coffee + chocolate began in the 17th century... https://t.co/F8anvanm8C https://t.co/AORitsy2…

2015-11-28 07:40:18

michiexile tweeted: @michiexile

RT @1c75a: SERIOUSLY IMPORTANT READING. https://t.co/enLcmmXmeY

2015-11-28 07:32:18

michiexile tweeted: @michiexile

RT @Asher_Wolf: Read this entire thread: https://t.co/hkuvMfb1Pr

2015-11-28 07:32:17

rmathematicus tweeted: @rmathematicus

RT @ptak: Willard's chronographer #dataviz #maps https://t.co/nXinb83Igx via @LOCMaps https://t.co/pA7bq7dGFm

2015-11-28 07:31:11

michiexile tweeted: @michiexile

RT @solitarysnail: @solitarysnail Bonus reason: Self defense ~= prison anyway if I shoot a cis white man

2015-11-28 07:26:45

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