مَا شَاعِرٌ إِلَّا زَيْدٌ
No one is a poet except Zayd.
If the listener supposes both Zayd and ʿAmr are poets, “No one is a poet except Zayd” rejects ʿAmr’s participation, making it ifrād in the direction attribute-to-subject.
The restriction concerns who possesses the attribute of poetry; it says nothing about Zayd’s other qualities. Ifrād can correct imagined co-possession by multiple subjects as well as imagined conjunction of qualities in one subject.
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Qasr: Definitions, Real and Relative Restriction, and Ifrād, Qalb and Taʿyīn
مَا شَاعِرٌ إِلَّا زَيْدٌ
No one is a poet except Zayd.
If the listener supposes both Zayd and ʿAmr are poets, “No one is a poet except Zayd” rejects ʿAmr’s participation, making it ifrād in the direction attribute-to-subject.
The restriction concerns who possesses the attribute of poetry; it says nothing about Zayd’s other qualities. Ifrād can correct imagined co-possession by multiple subjects as well as imagined conjunction of qualities in one subject.