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10:59 AM | Of Sheep, Literalism, and Language

I got a kick out of Evelyn Lamb's latest posting at her "Roots of Unity" blog:http://blogs.scientificamerican.com/roots-of-unity/the-unbearable-literalism-of-being-a-mathematician/I enjoyed two things in particular: First she employs one of my favorite old math jokes... about the astronomer, physicist, and mathematician (in her rendition) who see a black sheep in a Scottish field... I won't

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7/01/2015Here is another puzzle by Henry Dudeney, from his book "Amusement in Mathematics":
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Infinity shreds our intuitions. Continue reading →

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

(Click on the comic if you can't see the full image.) (C)Copyright 2015, C. Burke.From the Italian for "Grandma-gon". More formally as Nonna-gon. Come back often for more funny math and geeky comics.

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10:52 PM | Fast Formulas #6: Finding the Time

The Fast Formulas on this blog provide shortcut calculations for financial instruments such as mortgages and bonds. Most formulas involve the symbol n to represent the number of periods (e.g. years or months) until the end of the instrument. Usually … Continue reading →

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Once again, a math problem has gone viral. And like Cheryl’s birthday problem, once again the buzz is accompanied with disparaging comments against women. What is 0 divided by 0? Apple included a joke in its iPhone. If you ask this to Siri, “she” gives the response: Imagine that you have zero cookies and you … Continue reading Why Can’t You Divide By 0? Why Siri Is Correct (Kind Of)

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9:21 PM | Algebra Fact on Twitter: "The last digit of any integer and its fifth power are the same."

Algebra Fact on Twitter: "The last digit of any integer and its fifth power are the same."

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We're so proud to provide a platform for all the incredibly talented LGBTQ writers who are advocating for change and sharing their stories on WordPress.com.

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3:23 PM | June Favorites

It’s the end of June and I have no idea how this month pasted so quickly. So many things happened for me this month. First of all I graduated and it was quite overwhelming (it was a combination of being proud, scared and excited at the same time). Here is a photo from the event: […]

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Question 34, the first Part IV question of the New York State Geometry (Common Core) Regents exam for June 2015, read as follows: The water tower in the picture below is modeled by the two-dimensional figure beside it. The water tower is composed of a hemisphere, a cylinder, and a cone. Let C be the center of the hemisphere and let D be the center of the base of the cone. If AC = 8.5 feet, BF = 25 feet, and m∠EFD = 47°, determine and state, to the nearest cubic foot, the volume of the
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8:30 AM | Leap Second

6/30/2015Just in case you did not get your memo from NASA:Before you go to bed tonight, move your clocks ahead by 1 second. NASA is adding a leap second tonight.The last leap second that was added occurred in 2012. So they don't happen often. But with a few exceptions, I don't think most people will notice the change. Still it will be refreshing to know that we will all get an extra second of sleep tonight.Source:
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7:30 AM | True or False

6/30/201563,015 is a 602-gonal, 6,303-gonal, and a 21,006-gonal number. It is a composite, deficient, Harshad, odd, Smith, sphenic, square-free, and unprimable number.Have you ever heard the rule that "There is an exception to every rule."?Is that rule true or false?If a rule had an exception then that rule would be false. Take the spelling rule "i before e, except after c". I think it is a weird rule. In the word "weird" the i does not come before the e, and there is no […]

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hyrodium:LTNS:)I made an animation of Lorenz Attractor.Long version: https://www.youtube.com/watch?v=v6UABhdh_lA

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When I mention I blog about game theory, most people have no idea about the subject, and a few people know it has something to do with the prisoner’s dilemma. Then I give a few examples of game theory and people usually want to learn more. I write the monthly series “game theory in the … Continue reading Matching markets book, Why we hate secrets, U.S. families can now negotiate with terrorists, strategic apathy in soccer, and why the President should get fast-track authority
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12:00 AM | Space Needle Climb

I'm climbing the Seattle Space Needle to raise money for cancer research.

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Need help getting your blog off the ground or getting readers engaged?

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1:03 PM | A Re-run Monday

I was reading the first of Greg Ross's "Futility Closet" volumes when I came across one of my favorite old puzzles, that was last presented here over 2 years ago. I originally learned of it from Richard Wiseman's blog and again I'll opt for Richard's version of it (most readers here are likely already familiar with it):
"Imagine there is a country with a lot of people. These people do not die,

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12:05 PM | Summer To-Do Diagram

(Click on the comic if you can't see the full image.) (C)Copyright 2015, C. Burke.It's oddly accurate while leaving out a whole lot of stuff. But definitely the proofreading! There are new curriculums to be learned, and I need to refresh in upper-level classes in case I'm called to teach those. And now is a good time to assess what worked and what didn't -- particularly, with the new material which I hadn't taught in the same manner before. So I'm not really off. ... except that I am.
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11:00 AM | Siobhan Roberts... Playing With Geniuses

Math-Frolic Interview #33
“John Conway is, by any standard, a very remarkable man, and he well
deserves a remarkable biography, which this book undoubtedly is. Siobhan
Roberts expertly conjures up a genuine picture of the man and his
amazing world.”
—Roger Penrose
If you don't already know the name Siobhan Roberts it's probably just a matter of a little more time. She is an

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7:30 AM | Brain-O Quiz Answers

6/29/20156,292,015 is a composite, Duffinian, odd, semiprime, square-free and unprimeable number.
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8:23 PM | Where Is The Car Parked? Viral Math Problem From Hong Kong, Plus 2 Variations. Sunday Puzzle

This mathematical question was asked to elementary students in Hong Kong. Students had 20 seconds to answer it. The problem went viral in 2014 because it stumped many adults. It went viral again recently because adults who see the problem for the first time still get confused. I was inspired by the problem to create … Continue reading Where Is The Car Parked? Viral Math Problem From Hong Kong, Plus 2 Variations. Sunday Puzzle

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Visit the original post Boost Performance of your Low End Computer to a new level for the best experience of reading!

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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

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http://t.co/urnbKwoiSY by @ulaulaman about #neutrino #tau #Opera #particlephysics From the press release: The OPERA (Oscillation Project with Emulsion-tRacking Apparatus) international experiment at the National Institute for Nuclear Physics (INFN) Gran Sasso Laboratory (Italy) has detected the fifth occurrence of a tau neutrino. The neutrino started its flight at CERN as muon neutrino and, after traveling 730 km through the Earth, it arrived at Gran Sasso Laboratories showing up as a tau
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DONUT Collaboration (2001). Observation of Tau Neutrino Interactions, Physics Letters B, 504 (3) 218-224. DOI: 10.1016/S0370-2693(01)00307-0

OPERA Collaboration (2014). Observation of tau neutrino appearance in the CNGS beam with the OPERA experiment, Progress of Theoretical and Experimental Physics, 101C01 DOI: 10.1093/ptep/ptu132

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#abstract from #arXiv via @ulaulaman A couple of mathematical abstracts from arXiv: N. Karjanto (2015). Calculus teaching and learning in South Korea Jurnal Matematika Integratif 9(2): 179-193, 2013 arXiv: 1504.07803v1This article discusses an experience of teaching Calculus classes for the freshmen students enrolled at Sungkyunkwan University, one of the private universities in South Korea. The teaching and learning approach is a balance combination between the teacher-oriented traditional
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N. Karjanto (2015). Calculus teaching and learning in South Korea, Jurnal Matematika Integratif 9(2): 179-193, 2013, arXiv: 1504.07803v1

Sandor Kiss (2015). Educational Challenges of Rubik's Cube, X Workshop on Particle Correlations and Femtoscopy, arXiv: 1505.00750v1

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Come scrivono i Rudi Mathematici, "John Forbes Nash se n'è andato". C'è poco da dire in situazioni del genere, se non provare a scrivere, magari della sua matematica. Ho provato a farlo in modi piuttosto indiretti, lo faccio oggi in un modo un po' più diretto.Uno dei risultati più importanti di John Nash è la scoperta dell'esistenza degli equilibri che portano il suo nome all'interno dei giochi non collaborativi. La teoria di base su questo genere di giochi prende le mosse da due suoi […]

Nash, J. (1950). Equilibrium points in n-person games, Proceedings of the National Academy of Sciences, 36 (1) 48-49. DOI: 10.1073/pnas.36.1.48

Nash J. (1951). Non-Cooperative Games, The Annals of Mathematics, 54 (2) 286-295. DOI: http://dx.doi.org/10.2307/1969529

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http://t.co/gCOlKccELA about #IngeLehmann #EarthCore #theCore #geophysics Inge Lehmann was a Danish seismologist and geophysicist. Using seismic data, she discovered the inner solid core of the Earth with some physical properties distinct from the outer liquid core: No rays emerged at epicentral distances between 112° and 154°. I then placed a smaller core inside the first core and let the velocity in it be larger so that a reflection would occur when the rays through the larger core met it.
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Lehmann, I. (1987). Seismology in the days of old, Eos, Transactions American Geophysical Union, 68 (3) 33. DOI: 10.1029/EO068i003p00033-02

Bolt, B. (1994). Inge Lehmann, Physics Today, 47 (1) 61. DOI: 10.1063/1.2808386

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bobloch tweeted: @bobloch

@druinok @delicategenius1 hell, 140 characters is hard...sacrifices need to be made. If a rogue 1 bites it, then so be it!

2015-07-02 03:27:33

MindAfterMath tweeted: @MindAfterMath

2015-07-02 03:17:52

profkeithdevlin tweeted: @profkeithdevlin

Worrying. Senility? "Scalia's dissent was more like an 8th grader's rant. http://t.co/jGQy24YTZs" http://t.co/vEHCa3c9VU

2015-07-02 03:17:17

bobloch tweeted: @bobloch

2015-07-02 03:08:39

MindAfterMath tweeted: @MindAfterMath

RT @KirkDBorne: RT @deeplearning4j > a cheat sheet for supervised and unsupervised learning algorithms: http://t.co/OFEoGeLSmY #DataScience…

2015-07-02 03:04:11

evelynjlamb tweeted: @evelynjlamb

Missed this when it first came out: visualizing numbers with dancing factorizations http://t.co/X0vF0zmBHw by @matthen2

2015-07-02 02:59:41

bobloch tweeted: @bobloch

@delicategenius Joe, you need to check out http://t.co/puKPRU0uvR, and follow @druinok @pvbuckley @tyson_doug and @gwaddellnvhs

2015-07-02 02:33:38

bobloch tweeted: @bobloch

OK folks, who has something ready for my friend with the kick-ass Seinfeld reference? https://t.co/tzLi2Jafli

2015-07-02 02:31:32

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