hol sum Sections HOLlib Doc
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Def x = y == (x = y  T)

is mentioned by

Thm* 'a,'b:S.
Thm* (x:'a+'b. abs_sum(rep_sum(x)) = x  'a+'b)
Thm* & (x:('a'b). is_sum_rep(x) = ((rep_sum(abs_sum(x))) = x))
[sum_iso]
Def is_sum_rep == f:'a'bu:'a+'b. (f = (rep_sum(u)))[his_sum_rep]
Def rep_sum
Def == u:'a+'b. InjCase(u
Def == u:'a+'b. InjCasepb:x:'ay:'b. (x = p)b
Def == u:'a+'b. InjCaseqb:x:'ay:'b. (y = q)b)
[hrep_sum]

In prior sections: hol hol bool hol min

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hol sum Sections HOLlib Doc