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Reference.org
Commutativity of conjunction
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<p>In <a href="/facts/Propositional_calculus/MNt5v31V">propositional logic</a>, the commutativity of conjunction is a <a href="/facts/Validity_(logic)/oMGkywGC">valid</a> <a href="/facts/Argument_form/foVBtMX4">argument form</a> and truth-functional <a href="/facts/Tautology_(logic)/p82wWMaN">tautology</a>. It is considered to be a law of <a href="/facts/Classical_logic/ls62MAms">classical logic</a>. It is the principle that the conjuncts of a <a href="/facts/Logical_conjunction/62uyyn1d">logical conjunction</a> may switch places with each other, while preserving the <a href="/facts/Truth-value/SY4e2w8l">truth-value</a> of the resulting proposition. </p>