hol sum Sections HOLlib Doc
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Def o == f:'a'bg:'a'bf o g

is mentioned by

Thm* 'c,'b,'a:S.
Thm* all
Thm* (f:'a  'c. all
Thm* (f:'a  'c(g:'b  'c. exists_unique
Thm* (f:'a  'c. (g:'b  'c(h:hsum('a'b 'c. and
Thm* (f:'a  'c. (g:'b  'c. (h:hsum('a'b 'c(equal(o(h,inl),f)
Thm* (f:'a  'c. (g:'b  'c. (h:hsum('a'b 'c,equal(o(h,inr),g)))))
[hsum_axiom]

In prior sections: hol combin

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hol sum Sections HOLlib Doc