At: tproj w f2 1 1 1 1 1
1. da: Collection(dec())
2. rho: Decl
3. tr: trace_env([[da]] rho)
4. y1: Label
5.
g:Label.
y1 =
g 
subtype_rel(({a:(
[[da]] rho)| tr.proj(g,kind(a)) } List); (rho(lbl_pr( < Trace, g > ))))
6. tr.y1
{a:(
[[da]] rho)| tr.proj(y1,kind(a)) } List
y1 =
y1
By: EqLblReflexive 0
Generated subgoals:None
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