Definition:Subcontrary Statements

Definition
Two statements are said to be subcontrary if they can both be true, but they cannot both be false.

Example
Let the Universe of Discourse be fruit.

The statements:


 * There exists some mango that is delicious.
 * There exists some mango that is not delicious.

are subcontrary.

Also see

 * Definition:Categorical Statement
 * Definition:Contradictory Statements
 * Definition:Contrary Statements
 * Definition:Square of Opposition


 * Law of Excluded Middle