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Theorem square-interval

(i * (i + 1)) / 2 ≤ (j * (j + 1)) / 2 + j0, (j * (j + 1)) / 2 + j0 < ((i + 1) * (i + 2)) / 2, j0 ≤ j, 0 ≤ i, 0 ≤ j0 ⊦ i = j

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