sirix.wordpress.com
Topics in Geometric Group Theory, day 1 | Fightin' the resistance of matter
https://sirix.wordpress.com/2007/06/26/topics-in-geometric-group-theory-day-1
Fightin’ the resistance of matter. Understanding maths and physics the hard way. Topics in Geometric Group Theory, day 1. June 26, 2007 in Mathematics. First thing about GGT I want to remark is very positive: it’s straightforward; one doesn’t need to read heavy books with definitions to acquaint with actual problems. After this first day I have a feeling that GGT (or rather GGT represented by people on this specific school/conference. Is very close to what Lieven Le Bruyn. People often try to express som...
godplaysdice.blogspot.com
God Plays Dice: Thousandth, and last, post.
http://godplaysdice.blogspot.com/2012/02/thousandth-and-last-post.html
A random walk through mathematics - mostly through the random part. Thousandth, and last, post. This is the last post here at God Plays Dice. It happens to be the thousandth, but I didn't plan that. I'm moving to Wordpress, and to gottwurfelt.wordpress.com. The obvious subdomain was taken, by somebody that I don't want to send traffic to.). So update your bookmarks, your feed readers, or whatever you kids are using to follow blogs these days. I'll see you there. February 9, 2012 at 2:09 AM.
godplaysdice.blogspot.com
God Plays Dice: December 2011
http://godplaysdice.blogspot.com/2011_12_01_archive.html
A random walk through mathematics - mostly through the random part. Solution to distance between random points from a sphere. So I asked on Sunday. The following question: pick two points on a unit sphere uniformly at random. What is the expected distance between them? Without loss of generality we can fix one of the points to be (1, 0, 0). The other will be chosen uniformly at random and will be (X, Y, Z). The distance between the two points is therefore. 1, and this can be rewritten as. 6 = 8/6 = 4/3.
godplaysdice.blogspot.com
God Plays Dice: August 2011
http://godplaysdice.blogspot.com/2011_08_01_archive.html
A random walk through mathematics - mostly through the random part. Some thoughts on the mathematics of tax withholding. Here's a question of some practical importance: let's say that I make $2,000 in each of the first six months of the year, and $4,000 in each of the second six months. Will I have more or less tax withheld than if I make $3,000 every month? So say that if you make 36 x. Per year, then your taxes will be f. Then you'd expect that if you make 3 x. In a given month, you will have f. More g...
godplaysdice.blogspot.com
God Plays Dice: Small sample sizes lead to high margins of error, unemployment version
http://godplaysdice.blogspot.com/2011/11/small-sample-sizes-lead-to-high-margins.html
A random walk through mathematics - mostly through the random part. Small sample sizes lead to high margins of error, unemployment version. The ten college majors with the lowest unemployment rates. From yahoo.com. I've heard about this from a friend who majored in astronomy and a friend who majored in geology; both of these are on the list, with an unemployment rate of zero. The unemployment rates of the ten majors they list are 0, 0, 0, 0, 0, 0, 1.3, 1.4, 1.6, and 2.2 percent. Blog post is quite similar.
godplaysdice.blogspot.com
God Plays Dice: March 2011
http://godplaysdice.blogspot.com/2011_03_01_archive.html
A random walk through mathematics - mostly through the random part. How long is the coast of Maryland? Last night's Final Jeopardy clue: "With 301 miles, it has the most coastline of current states that were part of the original 13 colonies." (Thanks to the Jeopardy! For the wording.). This agrees with the Wikipedia list. Which is sourced from official US government data. But as Mandelbrot told us. Coastlines are self-similar . (Link goes to the paper How Long is the Coast of Britain. Links to this post.
godplaysdice.blogspot.com
God Plays Dice: Solution to distance between random points from a sphere
http://godplaysdice.blogspot.com/2011/12/solution-to-distance-between-random.html
A random walk through mathematics - mostly through the random part. Solution to distance between random points from a sphere. So I asked on Sunday. The following question: pick two points on a unit sphere uniformly at random. What is the expected distance between them? Without loss of generality we can fix one of the points to be (1, 0, 0). The other will be chosen uniformly at random and will be (X, Y, Z). The distance between the two points is therefore. 1, and this can be rewritten as. 6 = 8/6 = 4/3.
godplaysdice.blogspot.com
God Plays Dice: November 2011
http://godplaysdice.blogspot.com/2011_11_01_archive.html
A random walk through mathematics - mostly through the random part. In which I declare four things which my probability class is not about. In class today, I said approximately this:. And people's decisions to stop having kids is independent of the sex of the children they've had - which says this isn't China, because people do interesting things under the one-child policy - but this isn't a class about that. Links to this post. The New York Times says that marketers are viewing this as a singular event.
godplaysdice.blogspot.com
God Plays Dice: Wind and Mr. Ug
http://godplaysdice.blogspot.com/2011/12/wind-and-mr-ug.html
A random walk through mathematics - mostly through the random part. Wind and Mr. Ug. You should watch Vi Hart's stop-motion animated story of Wind and Mr. Ug. Subscribe to: Post Comments (Atom). Subscribe in a reader. An American Physics Student in England. Confessions of a Mathematician. Data Mining: Text Mining, Visualization and Social Media. Good Math, Bad Math. Http:/ mathnotations.blogspot.com. Statistical Modeling, Causal Inference, and Social Science. The Universe of Discourse. Vlorbik on Math Ed.
godplaysdice.blogspot.com
God Plays Dice: October 2011
http://godplaysdice.blogspot.com/2011_10_01_archive.html
A random walk through mathematics - mostly through the random part. Solution to a puzzle from a few months ago. I never posted a solution to this puzzle. And today one of my students asked me about it. The puzzle was to find all three-digit numbers that, when multiplied by their successor, give a number concatenated with itself. So of course when you concatenate a three-digit number x. With itself, you get 1001 x. So the question becomes: when is k. 1) a multiple of 1001? Doesn't in fact have three digits.
