It includes a solution to the general problem of identifying graphs with Eulerian tours. In English, in the form of a poem.

And what do coasters have to do with this? Jever is a beer, and the problem of finding an Eulerian tour is on a coaster they distribute (in German).

**Edit, 1:28 pm**: In the comments, Wing says that he thought the post would be about Euler beer. Apparently there is a beer named Euler. Someone's auctioning off a coaster on ebay.

## 2 comments:

I first thought this was a post about Euler Beer. There is (was?) a beer called Euler in Europe; I've only seen a box of it once though.

There has been a 'Brewery Euler' in Wetzlar (about 50 miles north of Frankfurt). It got bankrupt a few years ago.

Their coasters are still available at http://www.bierdeckelsammler.net/deu_brauerei_show_654.htm

Alas no relation to mathematics.

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