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Weakening/ Attenuation / Law / Logic / Conditional / Fraassen: 1st A > B - 2nd A and C > B - on the other hand everyday language: here no weakening: E.g. ...if the match would have been additionally immersed in water... - (tacit ceteris paribus condition) - (weakening / ((s): what follows from n premises follows also from n +1 premises) - applies in logic, but not in everyday language.
B. van Fraassen
The Scientific Image Oxford 1980