Step
*
of Lemma
sum_of_geometric_prog
∀[r:CRng]. ∀[a:|r|]. ∀[n:ℕ]. (((1 +r (-r a)) * (Σ(r) 0 ≤ i < n. a ↑r i)) = (1 +r (-r (a ↑r n))) ∈ |r|)
BY
{ ((RepD THENM OnVar `n' NatInd) THENA Auto) }
1
.....basecase.....
1. r : CRng
2. a : |r|
3. n : ℤ
⊢ ((1 +r (-r a)) * (Σ(r) 0 ≤ i < 0. a ↑r i)) = (1 +r (-r (a ↑r 0))) ∈ |r|
2
.....upcase.....
1. r : CRng
2. a : |r|
3. n : ℤ
4. 0 < n
5. ((1 +r (-r a)) * (Σ(r) 0 ≤ i < n - 1. a ↑r i)) = (1 +r (-r (a ↑r (n - 1)))) ∈ |r|
⊢ ((1 +r (-r a)) * (Σ(r) 0 ≤ i < n. a ↑r i)) = (1 +r (-r (a ↑r n))) ∈ |r|
Latex:
Latex:
\mforall{}[r:CRng]. \mforall{}[a:|r|]. \mforall{}[n:\mBbbN{}]. (((1 +r (-r a)) * (\mSigma{}(r) 0 \mleq{} i < n. a \muparrow{}r i)) = (1 +r (-r (a \muparrow{}r n))))
By
Latex:
((RepD THENM OnVar `n' NatInd) THENA Auto)
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