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The controversial free-speech issue of whether the First Amendment protects the right to burn or deface an American flag is concerned with
Conversion
In logic, a method of changing a categorical proposition by interchanging its subject and predicate without altering its truth value.
Obversion
A logical operation that involves changing a categorical statement into its obverse by negating both the subject and predicate and changing the quality of the statement from affirmative to negative, or vice versa.
Contraposition
A method in logic for deriving a new statement by reversing and negating both the subject and predicate of the original statement.
Universal Proposition
A statement or proposition that asserts something of all members of a specific class or category.
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