I'm sorry that this work temproarily only works in page image for now
the problem lies in latex2html not being able to correctly parse pstricks nodes (pst-node) which is a dependency on the package I use for the euclidean drawings.
I'll try to get the picture into a eps soon and include it instead of typing directly the code.
f
G -----> H G
p \ /_ ----- ~ f(G)
\ / f ker f
G/ker f |
| 
![[parent]](http://images.planetmath.org:8080/images/uparrow.png)