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Step * 1 2 of Lemma test-change-equality

.....assertion..... 
1. L1 : ℕ List
2. L2 : ℤ List
3. L1 = L2 ∈ (ℤ List)
4. L1 = L2 ∈ (ℤ List)
⊢ L1 ∈ ℕ List
BY
{ Auto }

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Latex:

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Latex:
.....assertion..... 
1.  L1  :  \mBbbN{}  List
2.  L2  :  \mBbbZ{}  List
3.  L1  =  L2
4.  L1  =  L2
\mvdash{}  L1  \mmember{}  \mBbbN{}  List


By

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Latex:
Auto

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