Step
*
2
2
2
1
1
of Lemma
rcos-1-implies-at-least-2pi
1. x : {x:ℝ| r0 < x}
2. rcos(x) = r1
3. rcos(x) strictly-decreasing for x ∈ [r0, π]
4. rcos(x) strictly-increasing for x ∈ [π, 2 * π]
5. e : {e:ℝ| r0 < e}
6. x < 2 * π
7. π ≤ x
8. rcos(x) < rcos(2 * π)
⊢ False
BY
{ ((Assert 2 * π = (r0 + 2 * π) BY (nRNorm 0 THEN Auto)) THEN (RWO "-1" (-2) THENA Auto)) }
1
1. x : {x:ℝ| r0 < x}
2. rcos(x) = r1
3. rcos(x) strictly-decreasing for x ∈ [r0, π]
4. rcos(x) strictly-increasing for x ∈ [π, 2 * π]
5. e : {e:ℝ| r0 < e}
6. x < 2 * π
7. π ≤ x
8. rcos(x) < rcos(r0 + 2 * π)
9. 2 * π = (r0 + 2 * π)
⊢ False
Latex:
Latex:
1. x : \{x:\mBbbR{}| r0 < x\}
2. rcos(x) = r1
3. rcos(x) strictly-decreasing for x \mmember{} [r0, \mpi{}]
4. rcos(x) strictly-increasing for x \mmember{} [\mpi{}, 2 * \mpi{}]
5. e : \{e:\mBbbR{}| r0 < e\}
6. x < 2 * \mpi{}
7. \mpi{} \mleq{} x
8. rcos(x) < rcos(2 * \mpi{})
\mvdash{} False
By
Latex:
((Assert 2 * \mpi{} = (r0 + 2 * \mpi{}) BY (nRNorm 0 THEN Auto)) THEN (RWO "-1" (-2) THENA Auto))
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