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Let C = P' - (D1 + P/S). Then -0.5 < C <= 0.5. | Let C = P' - (D1 + P/S). Then -0.5 < C <= 0.5. | ||
Since F1' < F2' and they're both integers, we must have F2' - 0.5 > F1 (otherwise F1 would have rounded up to F2'). Therefore F2' - C > F1. Therefore S.(F2' - C - D1) > S.(F1 - D1). Therefore S.(F2' - C - D1) > I1. | |||
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