Step
*
of Lemma
update-assignment_wf
∀[Dom:Type]. ∀[a:FOAssignment(Dom)]. ∀[x:ℤ]. ∀[v:Dom].  (a[x := v] ∈ FOAssignment(Dom))
BY
{ (ProveWfLemma THEN Unfold `FOAssignment` 0 THEN Auto) }
Latex:
\mforall{}[Dom:Type].  \mforall{}[a:FOAssignment(Dom)].  \mforall{}[x:\mBbbZ{}].  \mforall{}[v:Dom].    (a[x  :=  v]  \mmember{}  FOAssignment(Dom))
By
(ProveWfLemma  THEN  Unfold  `FOAssignment`  0  THEN  Auto)
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