Step
*
4
1
of Lemma
assert-is_power
1. n1 : ℤ
2. x : ℤ
3. x < 0
4. 0 ≤ n1
5. r : ℤ
6. x = r^((2 * n1) + 1) ∈ ℤ
⊢ (-r^((2 * n1) + 1)) = (-r)^((2 * n1) + 1) ∈ ℤ
BY
{ (RWO "exp-minus" 0 THEN Auto) }
1
1. n1 : ℤ
2. x : ℤ
3. x < 0
4. 0 ≤ n1
5. r : ℤ
6. x = r^((2 * n1) + 1) ∈ ℤ
⊢ (-r^((2 * n1) + 1)) = if (((2 * n1) + 1) mod 2 =z 0) then r^((2 * n1) + 1) else -r^((2 * n1) + 1) fi ∈ ℤ
Latex:
Latex:
1. n1 : \mBbbZ{}
2. x : \mBbbZ{}
3. x < 0
4. 0 \mleq{} n1
5. r : \mBbbZ{}
6. x = r\^{}((2 * n1) + 1)
\mvdash{} (-r\^{}((2 * n1) + 1)) = (-r)\^{}((2 * n1) + 1)
By
Latex:
(RWO "exp-minus" 0 THEN Auto)
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