A predicate can apply to a whole in one sense but not to every part individually.
Example 1: The wall looks white overall.
Example 2: One corner of the wall is not white.
Both may be true. By contrast, 'Every part of the wall is white' and 'At least one part is not white' form a genuine contradictory pair.
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Identity of whole and part
Contradiction and the Eight Conditions
A predicate can apply to a whole in one sense but not to every part individually.
Example 1: The wall looks white overall.
Example 2: One corner of the wall is not white.
Both may be true. By contrast, 'Every part of the wall is white' and 'At least one part is not white' form a genuine contradictory pair.