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Theorem square-interval

r * (r + 1.r) ≤ r0 * (r0 + 1.r) + 2.r * r2, r0 * (r0 + 1.r) + 2.r * r2 < (r + 1.r) * (r + 2.r), r2 ≤ r0, 0.r ≤ r, 0.r ≤ r2 ⊦ r < r0 + 1.r ∧ r0 < r + 1.r

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