[isabelle-dev] Gromov Hyperbolicity

[Tobias Nipkow]

For those of you interested in formalization of Analysis

https://devel.isa-afp.org/entries/Gromov_Hyperbolicity.html

I would like to call your attention to this entry because it is rich in concepts 
and theorems that are more general than the actual focus of the article. I 
believe quite a bit of the material could be pulled out and made more visible. 
Here are some pointers:

1. Library/Complement contains both new generic material like "t3_space" but 
also new concepts like [mono_intros] for more automation in proving of 
inequalities. In short, there is a wealth of material that might be suitable for 
inclusion in HOL-Analysis.
I have already made a start by moving a few [simp] rules but that is it from me 
because I am not familiar enough with the Analysis material.

2. Hausdorff_Dinstance, Metric_Completion and Isometries stronly smell of 
generic concepts that should go somewhere else.
We need a discussion on whether any of the theories deserve a separate AFP entry.

Sebbastien has already made an effort to separate the generic from the specific. 
We should capitalize on that, but it needs a bit of voluntary work.

Tobias

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