Step
*
of Lemma
weak-Markov-principle
∀a,b:ℕ ⟶ ℕ.
((∀c:ℕ ⟶ ℕ. ((¬¬(∃n:ℕ. (¬((a n) = (c n) ∈ ℤ)))) ∨ (¬¬(∃n:ℕ. (¬((b n) = (c n) ∈ ℤ))))))
⇒ (∃n:ℕ. (¬((a n) = (b n) ∈ ℤ))))
BY
{ (InstLemma `weak-Markov-principle-alt` []
THEN RepeatFor 6 ((ParallelLast' THENW Auto))
THEN (RWO "-1" 0 THEN Auto)
THEN (D 0 THENA Auto)
THEN ExRepD
THEN D -1
THEN Auto) }
Latex:
Latex:
\mforall{}a,b:\mBbbN{} {}\mrightarrow{} \mBbbN{}.
((\mforall{}c:\mBbbN{} {}\mrightarrow{} \mBbbN{}. ((\mneg{}\mneg{}(\mexists{}n:\mBbbN{}. (\mneg{}((a n) = (c n))))) \mvee{} (\mneg{}\mneg{}(\mexists{}n:\mBbbN{}. (\mneg{}((b n) = (c n)))))))
{}\mRightarrow{} (\mexists{}n:\mBbbN{}. (\mneg{}((a n) = (b n)))))
By
Latex:
(InstLemma `weak-Markov-principle-alt` []
THEN RepeatFor 6 ((ParallelLast' THENW Auto))
THEN (RWO "-1" 0 THEN Auto)
THEN (D 0 THENA Auto)
THEN ExRepD
THEN D -1
THEN Auto)
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