Def P  Q == PQ

is mentioned

In prior sections: core fun 1 well fnd int 1 bool 1 union hol hol bool hol sum int 2 list 1 hol num hol prim rec hol arithmetic 1 hol list 1 hol list 2 hol arithmetic 3 hol arithmetic 4 hol arithmetic 5 hol one hol restr binder

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