«Lā ghulāma rajulin»: rajulin is a genitive muḍāf ilayh.
«Lā ʿishrīna dirhaman»: dirhaman is an accusative tamyīz.
Both nouns of lā depend on what follows them, but only the first is a true iḍāfa; the second is quasi-construct.
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Construct versus Quasi-Construct
Ism Inna and the Noun Governed by Lā of Generic Negation
«Lā ghulāma rajulin»: rajulin is a genitive muḍāf ilayh.
«Lā ʿishrīna dirhaman»: dirhaman is an accusative tamyīz.
Both nouns of lā depend on what follows them, but only the first is a true iḍāfa; the second is quasi-construct.