Step
*
of Lemma
last_append
∀[A,B:Top List]. last(A @ B) ~ last(B) supposing ¬↑null(B)
BY
{ (((InductionOnList THEN Reduce 0 THEN UnivCD) THENA Auto) THEN Try (Trivial)) }
1
1. u : Top
2. v : Top List
3. ∀[B:Top List]. last(v @ B) ~ last(B) supposing ¬↑null(B)
4. B : Top List
5. ¬↑null(B)
⊢ last([u / (v @ B)]) ~ last(B)
Latex:
Latex:
\mforall{}[A,B:Top List]. last(A @ B) \msim{} last(B) supposing \mneg{}\muparrow{}null(B)
By
Latex:
(((InductionOnList THEN Reduce 0 THEN UnivCD) THENA Auto) THEN Try (Trivial))
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