[isabelle] naming facts

Dear Isabelle,

When building an Isabelle script, I often have to come up with names for facts if I am not using them immediately. Coming up with meaningful names all the time is an intellectual burden I could live without when I'm concentrating on a proof. More importantly, even if I did come up with meaningful names all the time, I reckon they would soon get out-of-sync as I modified my script. I briefly tried *numbering* my steps, but again, the numbers quickly get out-of-order as my script evolves, and I have always to bear in mind which number I used last.

So, my current solution is to have an emacs macro that generates a sequence of 5 random letters when I press "C-c d", which I use to name my facts. I find this works rather well; I've not had a clash yet, and I don't have to engage my brain at all. Here's a little snippet from my current theory, to illustrate:

> with iecss and "0.prems"(2) have 
>   dakuy: "set S = set (initials (Graph V \<Lambda> E))" and
>   iuqxi: "set (initials (Graph V \<Lambda> E)) = set V" by auto
> from pqshe have wsegy: "set E = {}" by auto  
> hence hkimj: "E = []" by auto

How do other users approach this issue?


ps. One final thought: does there exist a tool that processes an Isabelle script to make it more readable, renaming steps with (say) ascending natural numbers, and removing unused names? I think that would be rather nice.

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