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ConverseNegationContrapositionDouble negationLogical norLaw of excluded middleProof by contradictionInverse functionConverse relationConditional proofHypothetical syllogismComplementNecessity and sufficiencyInverse elementNegative relationshipMaterial conditionalExclusive orMutual exclusivityInverse function ruleAdditive inverseEquationComplex conjugateInverse distributionSoundnessNor logicAntihomomorphismIf and only ifClausePlus and minus signsStrict conditionalIsomorphismOpposite categoryComplementary eventLogical consequenceReverse mathematicsSyllogismDifference of two squaresLogical equivalenceCause and effectAbsolute differenceCausal reasoningInverse hyperbolic functionsConcave functionModus tollensLogical biconditionalCommutative propertyLaw of noncontradictionMathematical proofRelevance logicTruth valueInequalitySheffer strokeLogical formCombinatory logicCorollaryCategorical propositionAffirmation and negationTime reversibilityConditional moodInequationSecond derivativeNull hypothesisNegation normal formSymmetric differenceBisection methodTherefore signScopeFunction compositionAsymmetric relationParityIndependenceBoolean expressionBackward inductionTautologyCancellation propertyRetrocausalityAntisymmetric relationLogical connectiveReductio ad absurdumComposition of relationsDistributive propertyAlternative hypothesisSyntaxCausal inferenceConditional probabilityAxiomatic systemPerpendicular distanceNull distributionConjunction introductionRule of inferenceParadoxes of material implicationProvability logicOutline of logicBinary functionLogarithmLogical conjunctionReciprocal ruleSupergolden ratioMultiplicative inverseBinary operation