is mentioned by

Def outr == u:'a+'b. InjCase(u; x. arb('b), x)	[houtr]
Def outl == u:'a+'b. InjCase(u; x. x, arb('a))	[houtl]

In prior sections: hol

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