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Step * 1 of Lemma dot-product-split-first

.....wf..... 
1. n : ℕ+
2. x : ℝ^n
3. y : ℝ^n
⊢ x⋅y ∈ ℝ
BY
{ Auto }

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Latex:

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Latex:
.....wf..... 
1.  n  :  \mBbbN{}\msupplus{}
2.  x  :  \mBbbR{}\^{}n
3.  y  :  \mBbbR{}\^{}n
\mvdash{}  x\mcdot{}y  \mmember{}  \mBbbR{}


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Latex:
Auto

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