[GAP Forum] van Kampen diagrams

[Petra Holmes]

Stephan,

Thank you for your reply.  But our question is whether a face exists that 
you can start building the patch from, not whether all faces can be the 
starting place.

Beth

On Mon, 8 Jan 2007, Stephan Rosebrock wrote:

> Dear Group Pub Forum,
>
>   this cannot be true since you could start building your patch
> with an octagon which hast negative curvature already.
>
> Best wishes
> Stephan Rosebrock
>
>
>
>>