The law of excluded middle is a classical law of logic first established by Aristotle that states any proposition is true or its negation is true.Any form of logic that adheres to the law of excluded middle can not handle degrees of truth. This doesn't mean that partial truths don't exist. Several modern forms of logic, such as fuzzy logic, can handle partial truths.
Principle of BivalenceThe principle of bivalence states that every proposition has exactly one truth value, either true or false. It's very similar to the law of excluded middle but can be shown to have semantic differences.
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