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principle of bivalence

The logical principle that states that all propositions have one truth-value, and they are either true or false. The principle of bivalance is similar to “the law of excluded middle,” but that law does not guarantee that all propositions are true or false. Some philosophers reject the principle of bivalence and argue that there can be more than two truth-values. Perhaps some propositions could be indeterminate or have degrees of truth.

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