Hi,

On Sun, Feb 07, 1999 at 09:48 +0100, Kaare Rasmussen wrote:

> I thought I had this information somewhere, but I can't find it. The
> 'funny' images that accompany SuSE Linux (in 5.2 it was blue, in 5.3
> green), can they be downloaded from somewhere?

Have a look at the attached message.

Ciao,
        Stefan



Hi,

On Thu, 16 Apr 1998, Kaare Rasmussen wrote:

> > It's one of our CD covers, I think the on of the 5.0. It's some kind
> > of Enriques surface, but please don't ask me about details, the
> > formula to compute this image it pretty complicated...
> 
> But perhaps you could tell me what an Enriques surface is?

It is a special family of algebraic surfaces studied by Federigo Enriques. 
A simple algebraic surface for example are all points that satisfy the
equation x�+y�+z�-1=0, which is a sphere with radius 1 and center at
origin. Enriques surfaces are something "similar", but the formula is
somewhat more complex ;-) In fact, you cannot see an Enriques surface
itself, but only some model of it. You can find details in the preface of
our handbook if you are interested. It is nontrivial to compute these
surfaces. The program that computes the surfaces is on the CD. It's called
"surf". 

    Hubert

PS: Have a look at http://www.mi.uni-erlangen.de/~endrass/en/page.html
    Stephan Endrass, a good friend of mine, is the author of "surf".
    There are very beautiful pictures on this site (go to the "parameter
    map"). Also, the animation is worth watching.
PPS: Want some challenge? Find the formula that gives you a torus ;-)

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