If designated matter already fully accounts for numerical distinction among particulars, introducing a formal distinction between nature and haecceity explains nothing that matter does not already explain.

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Designated matter(metaphysics - understanding what makes individual objects distinct): Physical stuff or material that is specifically marked or identified as belonging to one particular thing rather than another.
Numerical distinction(metaphysics - explaining individuality): The quality of being two separate things rather than one thing; what makes one person different from another person, not just in qualities but in being a different individual.
formal distinction(Scotus's account of the relationship between nature and haecceity in a particular): A distinction between inseparable features that are nonetheless not identical — neither really distinct nor merely conceptually distinct
haecceity(Metaphysics of modality and personal identity): The property of being that very individual; for individual a, the haecceity is the property of being a

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