Formula 1: 'For half of it give fulus; for the other half give silver equal to half minus one grain.'
Result: 50 silver units assigned against 49; Abu Hanifah invalidates the entire composite exchange while the disciples uphold the fulus portion.
Formula 2: 'Give fulus worth half a dirham and silver equal to half minus a grain.'
Result: 49 silver units may be matched against 49; the remaining original silver is matched to fulus, so Quduri validates it.
The pivotal point is how the consideration is allocated by the wording.
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Side-by-side analysis of the two formulas
Bab al-Sarf: Circulating Fulus, Obsolete Coins and Money-Changer Exchanges
Formula 1: 'For half of it give fulus; for the other half give silver equal to half minus one grain.'
Result: 50 silver units assigned against 49; Abu Hanifah invalidates the entire composite exchange while the disciples uphold the fulus portion.
Formula 2: 'Give fulus worth half a dirham and silver equal to half minus a grain.'
Result: 49 silver units may be matched against 49; the remaining original silver is matched to fulus, so Quduri validates it.
The pivotal point is how the consideration is allocated by the wording.