B15 · باب وجوه الاعتراض على العلل · Objections to effective causes: four invalid (counter-case, wrong construction, ruling without the cause, distinguishing), four valid (denial, reversal, inversion, counter-cause); and how to answer a counter-case (v2/232–249)

  1. B15.01 · الاعتراضات الفاسدة · Against an effective cause, four objections fail: the counter-case, "wrong construction", "the ruling exists without it", and distinguishing root from branch (v2/232–235)
  2. B15.02 · الممانعة · Denial is the root of objection: of the cause as such, of the feature, of the condition, and of the effect; claimant and denier are judged by substance, not form (v2/235–237)
  3. B15.03 · القلب · Reversal: making the effect the cause defeats a reasoning (taʿlīl) from ruling to ruling; equal rulings can instead support mutual inference (istidlāl); turning the opponent's feature into a witness against him is opposition with contradiction (v2/238–240)
  4. B15.04 · العكس · Inversion: the reverse of concomitance supports a cause; the inversion that yields a contrary ruling is a weak objection (v2/241–242)
  5. B15.05 · المعارضة · Opposition to the branch's ruling has five forms (two sound, one weak, two unsound); opposition by another cause in the root is always unsound (v2/242–246)
  6. B15.06 · دفع المناقضة · A counter-case hits only ṭard causes; the answer reconciles in four ways: by the feature's wording, its effect, the ruling sought, or the aim of the reasoning (v2/246–249)

B15.01 · الاعتراضات الفاسدة · Against an effective cause, four objections fail: the counter-case, "wrong construction", "the ruling exists without it", and distinguishing root from branch (v2/232–235)

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B15.02 · الممانعة · Denial is the root of objection: of the cause as such, of the feature, of the condition, and of the effect; claimant and denier are judged by substance, not form (v2/235–237)

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B15.03 · القلب · Reversal: making the effect the cause defeats a reasoning (taʿlīl) from ruling to ruling; equal rulings can instead support mutual inference (istidlāl); turning the opponent's feature into a witness against him is opposition with contradiction (v2/238–240)

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B15.04 · العكس · Inversion: the reverse of concomitance supports a cause; the inversion that yields a contrary ruling is a weak objection (v2/241–242)

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B15.05 · المعارضة · Opposition to the branch's ruling has five forms (two sound, one weak, two unsound); opposition by another cause in the root is always unsound (v2/242–246)

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B15.06 · دفع المناقضة · A counter-case hits only ṭard causes; the answer reconciles in four ways: by the feature's wording, its effect, the ruling sought, or the aim of the reasoning (v2/246–249)

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