Step * of Lemma free-append-assoc

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[X:Type]. ∀[x,y,z:free-word(X)].  (x z ∈ free-word(X))
BY
(Auto THEN (Subst' THENM Auto)) }

1
.....equality..... 
1. Type
2. free-word(X)
3. free-word(X)
4. free-word(X)
⊢ z


Latex:


Latex:
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\mforall{}[X:Type].  \mforall{}[x,y,z:free-word(X)].    (x  +  y  +  z  =  x  +  y  +  z)


By


Latex:
(Auto  THEN  (Subst'  x  +  y  +  z  \msim{}  x  +  y  +  z  0  THENM  Auto))




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