Who Cites trace projection?
trace_projection	Def tr | P == filter(x.P(kind(x));tr)
	Thm* d:Decl, tr:(d) List, P:(Label). tr | P (d) List
kind	Def kind(a) == 1of(a)
	Thm* d:Decl, a:(d). kind(a) Label
filter	Def filter(P;l) == reduce(a,v. if P(a) [a / v] else v fi;nil;l)
	Thm* T:Type, P:(T), l:T List. filter(P;l) T List
pi1	Def 1of(t) == t.1
	Thm* A:Type, B:(AType), p:(a:AB(a)). 1of(p) A
reduce	Def reduce(f;k;as) == Case of as; nil k ; a.as' f(a,reduce(f;k;as')) (recursive)
	Thm* A,B:Type, f:(ABB), k:B, as:A List. reduce(f;k;as) B

Syntax:

tr | P

has structure:

trace_projection(tr; P)

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