Def {i...j} == {k:| ik & kj }

is mentioned by

Thm* L:T List, n:{0...||L||}. (firstn(n;L) @ nth_tl(n;L)) = L

[append_firstn_lastn]

In prior sections: int 1 list 1

Try larger context: MarkB generic IF YOU CAN SEE THIS go to /sfa/Nuprl/Shared/Xindentation_hack_doc.html