core StandardLIB Doc
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Def 2of(t) == t.2

is mentioned by

Thm* B:(AType), p:(x:AB(x)), C:Type, b:(x:AB(x)C).
Thm* (p/x,yb(x,y)) = b(1of(p),2of(p))
[spread_to_pi12]
Thm* B:(AType), p:(a:AB(a)). <1of(p),2of(p)> = p  a:AB(a)[pair_eta_rw]

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core StandardLIB Doc