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Level 150

Logic: Statements of Truth


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Tautology
statement that is always true by logical structure
inconsistent
false under every possible assignment of truth values to its variables.
contingent
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.
consistent
two statements can both be true at the same time
validity
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