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Step * 1 2 1 1 of Lemma equipollent-nat-rationals


ℕ × ℕ ~ ℕ × ℕ+
BY
{ xxxAssert ⌜ℕ+ ~ {1...}⌝⋅xxx }

1
.....assertion..... 
ℕ+ ~ {1...}

2
1. ℕ+ ~ {1...}
⊢ ℕ × ℕ ~ ℕ × ℕ+

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Latex:

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Latex:

\mBbbN{}  \mtimes{}  \mBbbN{}  \msim{}  \mBbbN{}  \mtimes{}  \mBbbN{}\msupplus{}


By

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Latex:
xxxAssert  \mkleeneopen{}\mBbbN{}\msupplus{}  \msim{}  \{1...\}\mkleeneclose{}\mcdot{}xxx

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