Applet for discrete dynamical systems

I’m teaching the last two weeks of one of my colleagues’ Differential Equations course. I’m leading the class through a chapter on discrete dynamical systems. In preparation for the first lecture I created a couple of java applets using Geogebra. I thought others might be interested in them, so I’m linking to them here. The…

A new way to collaborate: DropBox

I have a long-time collaborator who lives in Georgia (I’m in Pennsylvania). I’ve had good luck collaborating with him via email, but it is a pain. As soon as one of us edits a file he sends it to the other person as an email attachment. We haven’t had any “forked” files, but we do…

An applet for teaching the limit of a sequence

I’m currently teaching real analysis. Right now we’re discussing limits of sequences. The definition is: The limit of a sequence is (or converges to ) if, given any , there exists a natural number such that for all . I used GeoGebra to create the following applet, which illustrates the definition of a limit. (Clicking…

LaTeX now available in Google Docs

Google Vice President and Chief Internet Evangelist (yes, that is really his title) and inventor of the internet Vint Cerf visited our campus a couple of years ago. At one point he asked about what people wanted from Google. I said that I would love a Google Docs/LaTeX mashup. How great would it be for…

A wiki about blogs

I just added my blog to the Mathematics/Statistics page of the Academic Blog Portal. As the name implies, this is a resource for gathering together links to academic blogs. The FAQ gives the purpose of the blog: This is a portal that is intended to provide resources for (a) academic bloggers, and (b) people who want…

The 56th Carnival of Mathematics is now online

Head over to Reasonable Deviations to see the 56th Carnival of Mathematics. I’d also like to point out a post by Terrence Tao on mathematical research and the internet. He has a link there to an interesting talk (5mb pdf file) that he is going to give on this subject.

Applets for multivariable calculus

When I was in Portland a few weeks ago for MathFest 2009 I attended the minicourse Creating Demonstrations and Guided Explorations for Multivariable Calculus using CalcPlot3D by Paul Seeburger. Paul has created some applets to be used in calculus classes (mostly, but not exclusively, multivariable calculus). They can be found on his Exploring Multivariable Calculus…

What is the LaTeX code for that?

It is hard to count how many times I’ve scrolled through Scott Pakin’s The Comprehensive LATEX Symbol List (pdf) looking for the LaTeX code for some obscure mathematical symbol. That pdf document may no longer be the first place I turn. Daniel Kirsch, a math student from Münster, Germany has created a very useful website…

Putting CVs online

I’ve had my CV online for quite some time. For a while I’d type it up, export it as a pdf, then upload it to my website. The problem was that I would only upload it once every six months or once a year—it was perpetually out of date. Then I made the switch to…

Recommended readings (4/27/09)

Barack Obama speaks to the 146th Annual Meeting of the National Academy of Sciences Calculus Made Easy: Being A Very Simplest Introduction To Those Beautiful Methods Of Reckoning Which Are Generally Called By The Terrifying Names Of The Differential Calculus And The Integral Calculus (2nd Ed., 1914), by Silvanus P. Thompson ~ What one fool…

My virtual seminar goes live

I love my job—I teach at a small, highly selective liberal arts college. It is a great place to work. But one thing I miss from my days at big research universities is the constant stream of research mathematicians who give seminars and colloquia.  I am within two hours of Philadelphia, Baltimore, Washington DC, and…

Students as Facebook friends?

I’ve been on Facebook for approximately six months. I resisted for a long time, but caved in eventually. While there are many things I dislike about Facebook, it can be an interesting trip down memory lane (As Lev Grossman wrote in Why Facebook Is for Old Fogies, “son, we’ve lost track of more people than you’ve…