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‘Just in case’: if and only if?

The prevailing view in North American philosophical writing seems to be that the phrase 'just in case' can be translated into the phrase 'if and only if'. Consequently, this view holds that the phrase 'just in case' is best symbolized by the logical connective known as the biconditional (↔). Now, this seems wrong to me for two reasons. One is the difference between 'just in case' in this sense and the sense it has in British English, as noted by Geoffrey K. Pullum: British English: "We'll bring an umbrella just in case it rains." American philosophers: "A formula is a tautology just in case it is true on all valuations." That's a fine difference to note, but I also have a...

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