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Step * 1 1 of Lemma divisibility-by-3-rule

.....assertion..... 
1. n : ℕ
2. a : ℕn ⟶ ℤ
⊢ 10 ≡ 1 mod 3
BY
{ xxx(With ⌜3⌝ (D 0)⋅ THEN Auto)xxx }

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Latex:

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Latex:
.....assertion..... 
1.  n  :  \mBbbN{}
2.  a  :  \mBbbN{}n  {}\mrightarrow{}  \mBbbZ{}
\mvdash{}  10  \mequiv{}  1  mod  3


By

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Latex:
xxx(With  \mkleeneopen{}3\mkleeneclose{}  (D  0)\mcdot{}  THEN  Auto)xxx

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