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Step * 1 1 of Lemma no-excluded-middle-using-partial

.....assertion..... 
1. ∀P:ℙ. (P ∨ (¬P))
⊢ n:partial(ℤ) ⟶ {b:𝔹| ↑b ⇐⇒ (n)↓} 
BY
{ TACTIC:RenameVar `magic' (-1)⋅ }

1
1. magic : ∀P:ℙ. (P ∨ (¬P))
⊢ n:partial(ℤ) ⟶ {b:𝔹| ↑b ⇐⇒ (n)↓} 

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Latex:

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Latex:
.....assertion..... 
1.  \mforall{}P:\mBbbP{}.  (P  \mvee{}  (\mneg{}P))
\mvdash{}  n:partial(\mBbbZ{})  {}\mrightarrow{}  \{b:\mBbbB{}|  \muparrow{}b  \mLeftarrow{}{}\mRightarrow{}  (n)\mdownarrow{}\} 


By

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Latex:
TACTIC:RenameVar  `magic'  (-1)\mcdot{}

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