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  • https://math.libretexts.org/Bookshelves/Mathematical_Logic_and_Proof/Proofs_and_Concepts_-_The_Fundamentals_of_Abstract_Mathematics_(Morris_and_Morris)/01%3A_Propositional_Logic/1.01%3A_Assertions_deductions_and_validity
    Roughly speaking, an assertion is a statement of fact, such as “The earth is bigger than the moon” or “Edmonton is the capital of Alberta.” However, it is important to remember that an assertion may b...Roughly speaking, an assertion is a statement of fact, such as “The earth is bigger than the moon” or “Edmonton is the capital of Alberta.” However, it is important to remember that an assertion may be false, in which case it is a mistake (or perhaps a deliberate lie), such as “There are less than 1,000 automobiles in all of Canada.” In many cases, the truth or falsity of an assertion depends on the situation.

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