Def as @ bs == Case of as; nil  bs ; a.as'  [a / (as' @ bs)]  (recursive)

is mentioned by

Def f  g == <1of(f) @ filter(a.a  dom(f);1of(g)),a.f(a)?g(a)>

[fpf-join]

In prior sections: list 1 mb list 1 mb list 2 mb event system 1 mb event system 3

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