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Step * 1 of Lemma ni-min-com


1. x : ℕ∞
2. y : ℕ∞
3. ni-min(x;y) = ni-min(x;y) ∈ (ℕ ⟶ 𝔹)
⊢ ni-min(x;y) = ni-min(y;x) ∈ (ℕ ⟶ 𝔹)
BY
{ (Ext⋅ THEN Auto THEN RenameVar `i' (-1) THEN RepUR ``ni-min`` 0 THEN AutoBoolCase ⌜x i⌝⋅) }

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Latex:

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Latex:

1.  x  :  \mBbbN{}\minfty{}
2.  y  :  \mBbbN{}\minfty{}
3.  ni-min(x;y)  =  ni-min(x;y)
\mvdash{}  ni-min(x;y)  =  ni-min(y;x)


By

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Latex:
(Ext\mcdot{}  THEN  Auto  THEN  RenameVar  `i'  (-1)  THEN  RepUR  ``ni-min``  0  THEN  AutoBoolCase  \mkleeneopen{}x  i\mkleeneclose{}\mcdot{})

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