rat 1 Sections StandardLIB Doc
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Def 1of(t) == t.1

is mentioned by

Def q.num == 1of(q)[qnumer]

In prior sections: core

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

rat 1 Sections StandardLIB Doc