Def x:T. P(x) == (x:T. P(x))

is mentioned by

Def is_sum_rep == f:'a'b. u:'a+'b. (f = (rep_sum(u)))

[his_sum_rep]

In prior sections: hol hol bool

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