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Centuries: 4th century - 5th century - 6th century

Decades: 400s 410s 420s 430s 440s - 450s - 460s 470s 480s 490s 500s

Years: 453 454 455 456 457 - 458 - 459 460 461 462 463




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Bivalence and related laws

... with vagueness, again it may be the case that (P or not-P) is true but P is not considered true or false. For example, suppose P is: Joe is bald. In this case, in ...