Step
*
of Lemma
prefix-replace_wf
∀[t,x:Name]. ∀[pre:pi_prefix()].  (prefix-replace(t;x;pre) ∈ pi_prefix())
BY
{ ProveWfLemma }
Latex:
Latex:
\mforall{}[t,x:Name].  \mforall{}[pre:pi\_prefix()].    (prefix-replace(t;x;pre)  \mmember{}  pi\_prefix())
By
Latex:
ProveWfLemma
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