Who Cites rprev?
rprev	Def p(i) == source(in(i))
	Thm* R:(Id), in,out:(|R|IdLnk), i:|R|. ring(R;in;out)  p(i)  |R|
lsrc	Def source(l) == 1of(l)
	Thm* l:IdLnk. source(l)  Id
pi1	Def 1of(t) == t.1
	Thm* A:Type, B:(AType), p:(a:AB(a)). 1of(p)  A

Syntax:

p(i)

has structure:

rprev(R; in; out; i)

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