# From the Backlog 2010

Thursday, February 21st, 2013 | Author:

I have to admit that I try to read more than I actually do, in particular blog posts. In this post I give you some links from 2010 that I now read skimmed a few weeks ago and found to be fresh enough to be shared again.

Category: English, Mathematics | Comments off

# An arrow notation for annotations

Saturday, October 27th, 2012 | Author:

Nowadays it is common to use $x \mapsto f(x)$ to denote that an element $x \in X$ is mapped to an element $f(x) \in Y$ by the map(ping) $f : X \to Y$. In particular, the arrow $\rightarrow$ (in LaTeX: \rightarrow) denotes a map, or more generally a morphism, while $\mapsto$ (in LaTeX: \mapsto) denotes how particular elements or objects are mapped to other elements or objects.

Have you ever seen an arrow which has a triangle as head? Like those:

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# Mathematics Resources

Saturday, May 05th, 2012 | Author:

This is a list of resources available on the web for research mathematicians, which used to be updated regularly. The first version was published May 5, 2012. The last update was on March 12, 2015, marked by [UPDATE 15-03-12]. It is now no longer actively maintained.

Category: English, Mathematics | 3 Comments

# Review – Seife: Decoding the Universe

Monday, August 16th, 2010 | Author:

I just finished Decoding the Universe - How the new science of information is explaining everything in the cosmos, from our brains to black holes, written 2006 by the former mathematics student and now associate professor of journalism Charles Seife, apparently well known for his other books Zero and Alpha&Omega (which I didn't read).
The book in Google Books and a much shorter review I wrote in German on Amazon.de

Category: English | One Comment

# Problematic elections

Sunday, January 24th, 2010 | Author:

Since I recently finished reading Donald G. Saari's wonderful book "Chaotic Elections - A Mathematician Looks at Voting" (published by the American Mathematical Society), I decided to give a short example of what goes wrong in elections, so you'll know how voting paradoxes influence our lives and why you should know something about it. This is about Germany, but I tried to design the example such that you don't have to know anything about Germany to understand it.