hol restr binder Sections HOLlib Doc
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Def @x:TP(x) == InjCase(lem({x:TP(x) }); xx, arb(T))

is mentioned by

Def res_choose('a;x.P(x);x.Q(x)) == @x:'a. (P(x) & Q(x))[res_choose]

In prior sections: hol hol min

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hol restr binder Sections HOLlib Doc