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Reasoning with 'unless' counterfactual conditionals

This article tackles factual and counterfactual 'unless' expressions such as "Virginia will not pass the exam unless she works harder" and "Virginia would not passed the exam unless she had worked harder". 'Unless' is a negative conditional that is semantically equivalent to 'if not'. However, some authers have claimed that 'unless' is more closely related to 'only if' than to 'if not'. We report two experiment...