» Tales from Monday
7 hours ago by Learning Curves
Sick. Losing my voice. Teaching lecture hall calculus with no voice is a challenge.At the beginning of class today, I showed the students the exam with the details blacked out CIA-style. At the end of class some students who showed up late asked to see the exam. No. (It's the first exam in calculus. Limits and derivatives.)Emailed the stats prof with a question about a homework problem that is due ...

» Apple are evil?
8 hours ago by The Endeavour from John
Mike Croucher wrote a post the other day explaining why he’s going to buy an iPad. He said that one of the objections to the iPad he’d heard was Apple are evil because they take away control of how we use their devices. I teased Mike that I would never say “Apple are evil.” On this side [...]

» Lengths of Weyl Group Elements
8 hours ago by The Unapologetic Mathematician from John Armstrong
With our theorem from last time about the Weyl group action, and the lemmas from earlier about simple roots and reflections, we can define a few notions that make discussing Weyl groups easier. Any Weyl group element can be written as a composition of simple reflections where all are simple roots for some [...]

» Twitter daily tip news
8 hours ago by The Endeavour from John
I have five Twitter accounts that send out one tip per day, including a new one I just added last week. Regular expressions @RegexTip started over today. It’s a cycle of tips for learning regular expressions. It sticks to the regular expression features common to Python, Perl, C#, and many other programming languages. This account posts Monday [...]

» An information theory puzzle
8 hours ago by Wild About Math! from Sol
My brother shared this puzzle with me this morning. He heard it on the radio but no solution was offered. Neither of us know what the answer is so I’m looking forward to one of you posting the answer in the comments. Here’s the puzzle: Bob and Alice are both millionaires. They’re both curious to know who is richer but they don’t want to tell the other one how much money th ...

» Who Dat?
11 hours ago by The Algorithmist from algorithmist
Just a quick shout out to friends and business associates from N.O., including Chris Giordano (director of tennis and sports club at the Hilton D/FW Lakes).  Congratulations on the superbowl win!

» Business Travel
12 hours ago by Adventures in Applied Math
Last week I was on business travel to our nation's capital. Now, as you all know, I hate travel, especially when it's business travel and not vacation travel. This was going to be a pretty long trip: leave home on Monday, return Friday night, and I was not feeling too happy about it. To make the trip more palatable, I arranged to have dinner on Wednesday night with one of my cousins who lives i ...

» Fun with JavaFX on Ubuntu Linux
15 hours ago by Walking Randomly from Mike Croucher
A friend of mine got me interested in JavaFX recently and my interest grew when I discovered that it had some nice charting functionality.  Dean Iverson has written some great tutorials on the subject over at his blog and includes a link to a demo showing some of the different plot types that are available. The [...]

» The history of Mathematics. From the BBC.
21 hours ago by Is all about math Weblog from isallaboutmath

» The End of Defining Chaos: Mixing it all together
1 day ago by Good Math, Bad Math
The last major property of a chaotic system is topological mixing. You can think of mixing as being, in some sense, the opposite of the dense periodic orbits property. Intuitively, the dense orbits tell you that things that are arbitrarily close together for arbitrarily long periods of time can have vastly different behaviors. Mixing means that things that are arbitrarily far apart will eventuall ...

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