The residual category of 'particle' in Fârâbî's framework risks being defined purely negatively, making the classification of 'estin' trivially true rather than substantively explanatory.

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Fârâbî(as a historical philosopher being referenced): A medieval Islamic philosopher (10th century) who wrote about logic and metaphysics; he's being discussed here because of his ideas about how language works.
Residual category(what the theory challenges): A leftover group of things that don't fit neatly into other categories—in this case, needs that are unique to specific cultures rather than shared by all.
classification(Kitcher's framework for analyzing argument patterns in scientific explanation): A description of which sentences in a schematic argument are premises and which are conclusions, together with a specification of what rules of inference are used.
defined purely negatively(the weakness being identified): Explained only by saying what something is NOT, rather than what it actually IS.

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