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..., it is one of two postulated truth values, along with its [[negation]], [[logical truth|truth]].<ref>Jennifer Fisher, ''On the Philosophy of Logic'', Thomson ...ruth not only in classical logic and Boolean logic, but also in most other logical systems, as explained below. ...

...he truth values of its constituent parts must satisfy the relevant logical connectives that occur in it (most commonly: [and], [or], [not], [only if], [if and onl * [[Affirming a disjunct]] – concluding that one disjunct of a [[logical disjunction]] must be false because the other disjunct is true; ''A or B; A ...

...ted step-by-step reasoning that humans use when they solve puzzles or make logical [[Deductive reasoning|deductions]].<ref> ...al logic]] (which operates on statements that are true or false and uses [[logical connective]]s such as "and", "or", "not" and "implies")<ref name="Propositi ...