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Logic: Statements of Truth

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statement that is always true by logical structure
false under every possible assignment of truth values to its variables.
at least one assignment of truth values to its variables under which the main connective is true, and at least one where it is false.
two statements can both be true at the same time
an argument is an instance of a valid argument form.
short truth table method
set truth to assumptions, and falsity to conclusion. If it works, then it is invalid!
b: contingent
A --> B
B: inconsistent
A --> B
B: consistent
A --> B