Archive for August, 2007

WikiScanner = Vanity UnFair or UnBalanced?

Friday, August 31st, 2007

 All is Vanity

Self-interest in Wikipedia edits has been unmasked by a tool called WikiScanner (wiki, faq). It was created by self-described disruptive technologist Virgil Griffith (homepage).  I was able to use it to quickly find that someone at Fox News had altered Al Franken‘s page under the sub-heading Conflict with the Fox News Network (click below for before & after). 

Unfair or Unbalanced

But Fox is by no means alone. As reported on Colbert, someone at the NY Times added “jerk …” to George W’s wiki entry. Corporations enjoy politicking too. Someone at Land O’Lakes wrote:

The Republican Party of Minnesota is basically a front for the crooks, liars and religious zealots that strangly enough call themselves “human”.

For balanced vandalism, someone at the ACLU wrote slanders on Pope Benedict XVI’s page; and, no doubt in an exercise of freedom of speech, someone at the NAACP inserted “bugly wugly my ugly lugly” in the Declaration of Independence page.

Wired‘s Threat Level blog has an updated list where you can submit and vote for the most shameful wiki spins

 “Vanity of vanities, all is vanity“. – Ecclesiastes

Update: The Boston Globe has an article about this.

Clarification: ‘George W’ does not refer to George Washington.

Crises += PhDs – Math SATs

Wednesday, August 29th, 2007

Sputnik stamp     911 stamp

Khodayar Akhavi points out that education funding is nowhere near as generous after the 911 crisis as it was after the Sputnik crisis (which may have ended with Gene Cernan’s last footprint on the Moon). Nevertheless, PhD production in the U.S. seems to have picked up after both crises.

PhD Production

The College Board just released figures for the 2007 SATs.  I looked at the scores for Math in States where at least 40% of the student population took the exams, and compared the rankings for 1997 (left) to 2007 (right).  The rankings are color coded in quintiles, with legend Red, Yellow, Green, Blue, and Violet (Red the worst).  Making double jumps up in the rankings are NC, VA, and VT; double jumps down are MD and ME.  Maine should get a bye, since this year it forced 100% of its eligible students to take the exam.  IN, TX, and NV should get special mention as the only non-coastal States to have at least 40% SAT participation. 

Math SAT Rankings by State 1997 & 2007

Update: While SC as a State improved, Miss SC Teen has issues with geography & numericity.

Carnival of Mathematics XV = phosted!

Friday, August 24th, 2007

Com-XV

Music: A Mathematical Offering

Welcome to the 15th Carnival of Mathematics.  While the quantity is low during these doldrum months, I think the quality of this episode is excellent.  The contents also speak to the question du Jore of whether the CoM should be bifurcated into separate teaching and research Carnival?  We actually have a research contribution that is explainable in elementary terms and has everyday application – if you eat McNuggets everyday (not recommended)! 

But before that, because I surely will be asked (again), let me point out I-am-only-related-by-name-to-the-late-famous-Professor-John-G-Kemeny.  My favorite anecdote about him is when he was appointed President of Dartmouth he requested to continue teaching.  The Board thought that was beneath the position.  So he asked what they would say if he requested time to play golf.  He got to teach.

My father-in-law, Bill Curnin, is a retired professor, and pointed out a Brief History of Mathematics, which he has used in the classroom since 1948.  While there I noted the 1954 poem A Song … Against Mathematicians which begins:

Of all the lunatic professions which are practised on this earth
Mathematics is the craziest, and has been from its birth.

I thought to enlarge upon this in poet laureate style:

I must read and study math again, where tensor algebras Lie,
And all I need is a Kronecker delta, an epsilon and pi;

I immediately realized I wasn’t up to the poetry nor math – so you’ll have to bear with my limericks.

Fear Factor

Chapter 1: 3599..

Taking pairs from the number nine closet,
And appending to 35, I’ll posit,
When factoring’s done,
Some 6*10N plus one,
Is a divsor. The results’ all composite!

In Teaching Factoring – Should we?, Jonathan (aka jd2718) kicks off a series of 4 articles on rationales for what we should teach our children.  In the second article published today, I ban FOIL, he explains how his school handles polynomials to make factoring easier.  The next article will be on the trinomial factoring technique, breaking the middle.  Jonathan says, “It’s not uncommon, but many people have never seen it.”  The last article will cover other sorts of factoring and anecdotes.  For reference, there are internet discussions on factoring, and/or you can just do communal factoring on your PC.

Chapter 2: A tale of five gentlemen

van A & N 15-7

Henricus Hubertus van Aubel (1830-1906), was a Dutch mathematician who proved a pretty theorem on quadrilaterals.  A. Gutierrez has a javascript conventional proof, accompanied by Chopin, online.  Wesley Cowans of FOXMATHS! did one better. His proof of van Aubel’s theorem uses complex numbers instead of standard geometric techniques.

 This problem has an interesting history.  It is related to a theorem attributed to Napoleon, often called the most rediscovered theorem in mathematics.  

Petr-Newmann-DouglasA generalization of both theorems is attributed to three men, Karel Petr, Bernhard Newmann, and Jesse Douglas (proof and interactive gizmo by Alex Bogomolny).  Petr (1868-1950) was a high-powered Czech math professor before, during, and after two World Wars – with many students-turned-refugees.  Newmann has a history with Napoleon’s Theorem explained in an Australian interview entitled Napoleon, my Father and I. Douglas, co-winner of the first Fields Medal, working independently (pdf) at the same time as Newmann (1939-1941) had an incredibly prolific year in 1939.  He is also a fellow Bronxite.  Of course, as Stephen Gray points out in his 2002 article Generalizing the Petr-Douglas-Neumann Theorem on n-gons (pdf), Petr has precedence, publishing in 1908!  

Chapter 3: Pay me now or and pay me later 

CEO Compensation dilbert John Armstrong, the Unapologetic Mathematician, tackles a solution to an actual, real-world  data analysis problem, CEO Compensation and its relationship to corporate profits. What relationship? John has been in an Ivory Tower too long. Read Dilbert. (just kidding – actually a thoughtful article)

 

 

 

Chapter 4: Study now or and study later

SAT

Dave Marain at MathNotations sent in How Recursion is Tested on the SATs and much more… Designed for middle- and high schoolers, this detailed investigation for the classroom explores the ideas of recursive-defined sequences using an SAT-type problem as a springboard.

That’s my son Alan studying at the blackboard. He should be ready for SATs in about 15 years.  I wonder if they will have changed much, viz., no portable AI-bots in the exam room?

 

Chapter 5: 263

4D Magic Cube Julie Rehmeyer reports some news about advances in solving Rubik’s Cube in Cracking the Cube in MathTrek. Northeastern professor Gene Cooperman and grad student Dan Kunkle have discovered a way, using high-powered computation, to reduce the maximum number of moves to solve the puzzle by 1, to 26. However, there is room left for improvement, as it is believed that 20 moves may be the minimum. If that’s too simple, here is an online 4D Magic Cube to play.

Julie also writes an interesting article on mathematically modeling word acquisition in Calculating the Word Spurt.

 

Chapter 6: 43 McNuggets to don’t go

A student of Shalit’s named Xu,
Discovered some math that is new,
There are Frobenius things,
Taken from co-finite strings,
Constructed so they exponentially grew.

Here is the fresh research article, The Noncommutative Frobenius Problem is Solved!, from professor Jeffrey Shalit at Recursivity.  It is well explained, and the tie-in to McNuggets is delicious.

Chapter 7: For Smarties Only, NOT!

Secret Blogging Seminar is a group blog by 8 recent and future Berkeley mathematics Ph.D.’s. Sound intimidating?  Not always.  Take, for example, Scott Carnahan’s piece p-adic fields for beginners.  You could learn something.  Then there is Noah Snyder’s The Minkowski Bound. Not frivolous!

The following rating system I devised, analogous to the movie rating system (G, PG, PG-13, R, NC-17), should help you identify appropriate articles:-)

  • γ = Graduate Level
  • π Γ = Post-Graduate
  • π Γ – XIII = 13-year old Post-Graduate
  • ρ = Rudimentary
  • ν Χ – XVII= Nearly Comatose 17-year old

Epilogue: Off to the movies

That’s where I’m going.  But you should stay and exercize your brain here (thanks Alvaro Fernandez & Praveen).  Oh, I wanted to congratulate Sherry Gong, from Exeter, N.H., who earned a gold medal and tied for first place at the 2007 China Mathematical Olympiad for Girls, which was held in Wuhan, China, from August 11-16.

math is 4 girls 2

Carnival of Mathematics XV = hosted here!

Friday, August 10th, 2007

15th CoM 

That’s right, on 24-August I will be publishing the 15th CoM.  Right again, Alon mispelt the name of the blog, substiuting ‘blog’ for ‘bog’ in a mispelt bog, which is just irony (pun intended).

Anyway, send your entries to the Carnival through here or direct an email to johnkemeny at yahoo dot com.  It would be helpful to include ‘Carnival’ or ‘CoM’ in the subject line.