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Soft deductions

Please give a detail explanation and example of soft deductions, what is the purpose??

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You already know that a deductive argument is one that claims a specific sort of relationship between the premise(s) and conclusion. The claim is that, if the premises are true, the conclusion cannot be false (or, true premise(s) and a false conclusion is impossible). This means that deductive arguments "want" to be valid. Whether or not the premise(s) is(are) actually true is beside the point here; deduction is about the structre of the argument first ...