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Definitions: FSc Part 1 (Mathematics): PTB
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ble involved in it is called tautology.\\ e.g. $p\rightarrow q\leftrightarrow (\sim q \rightarrow \sim p)$ is a tautology. * **Contradiction:** A statement which is always false is ca... n the truth values of variable. \\ e.g. $(p \longrightarrow q)\wedge (p \vee q)$ is the contingency. * **F