Hi Mario,
Welcome to the list!
The proofs on the Metamath web page are actually displayed in a tree like way, if you look at the identation:
Take for example:
http://us2.metamath.org:88/mpeuni/tfr2.html
You'll notice the final statement (step 7) has an indentation of
"1". The statements it refers to (steps 5 and 6) both have an
indentation of "2", and so on. It's not strictly a tree, as some
tree leafs may be referred to from different branches (here, step
1 is used both in steps 2 and 6)
You've already asked about MMJ2, that's the IDE of choice.
I've built a Metamath plug-in for Eclipse, but I've also had feedback it's not easy to install.
I'm sorry I've not used the Latex output, I can't help with that
question..
BR,
_
Thierry
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