hol restr binder Sections HOLlib Doc
IF YOU CAN SEE THIS go to /sfa/Nuprl/Shared/Xindentation_hack_doc.html
Def res_choose('a;x.P(x);x.Q(x)) == @x:'a. (P(x) & Q(x))

is mentioned by

Def res_select == P:'aQ:'a. res_choose('a;x.(P(x));x.(Q(x)))[hres_select]

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hol restr binder Sections HOLlib Doc