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Conditional / truth value/ Fraassen: the truth value of the conditional is partly context-dependent - but science does not imply that the context is either way somehow - therefore science implies counterfactual conditionals at most in the limiting case where a conditional has the same truth value in all contexts - in this case the theory plus antecedent (conditions) strictly implies the consequent. - Then also the laws of attenuation and contraposition apply - but then they are useless for our task to provide an explanation.
B. van Fraassen
The Scientific Image Oxford 1980