In an uncertainty context, what does “جاءني زيد أو عمرو” mean?

The Subject of Predication: Coordination, Separation, Preposing and the Scope of Negation

• Certain joint participation
• Certain nonarrival of both
• The entrant is Zayd or ʿAmr, not identified with certainty
• ʿAmr’s delayed arrival after Zayd