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Logical equivalence
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==See also== {{Portal|Philosophy|Psychology}} * [[Logical consequence|Entailment]] * [[Equisatisfiability]] * [[If and only if]] * [[Logical biconditional]] * [[Logical equality]] * [[Mathematical Operators (Unicode block)#Block|β‘]] the iff symbol (U+2261 ''IDENTICAL TO'') * [[Mathematical Operators (Unicode block)#Block|β·]] the ''a'' is to ''b'' '''as''' ''c'' is to ''d'' symbol (U+2237 ''PROPORTION'') * [[Arrows (Unicode_block)#Block|β]] the [[Blackboard bold|double struck]] biconditional (U+21D4 ''LEFT RIGHT DOUBLE ARROW'') * [[Arrow (symbol)#Arrows_in_Unicode|β]] the bidirectional arrow (U+2194 ''LEFT RIGHT ARROW'')
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