Step
*
of Lemma
map-append-empty
∀[f,b:Top].  (map(f;b) @ [] ~ map(f;b))
BY
{ ListIndSq `b' }
Latex:
Latex:
\mforall{}[f,b:Top].    (map(f;b)  @  []  \msim{}  map(f;b))
By
Latex:
ListIndSq  `b'
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