Some predicates are relational. A person may be someone's father but not another person's father.
Example 1: Zayd is Amr's father.
Example 2: Zayd is not Bakr's father.
Both may be true. A contradictory pair holds the relation fixed: 'Zayd is Amr's father' and 'Zayd is not Amr's father.'
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Identity of relational standpoint
Contradiction and the Eight Conditions
Some predicates are relational. A person may be someone's father but not another person's father.
Example 1: Zayd is Amr's father.
Example 2: Zayd is not Bakr's father.
Both may be true. A contradictory pair holds the relation fixed: 'Zayd is Amr's father' and 'Zayd is not Amr's father.'