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Possibility in modal logic

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    Does anyone else find it unreasonable to have ◊P in modal logic?
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    yeah it is totally unreasonable !
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    (Original post by see-are)
    yeah it is totally unreasonable !
    I should make a fb page on this!
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    Modal Logic is hard to understand :sad:
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    (Original post by Person1001)
    Does anyone else find it unreasonable to have ◊P in modal logic?
    Just read about it in wiki. Why is it unreasonable? Would it have any use without that?
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    (Original post by viriol)
    Just read about it in wiki. Why is it unreasonable? Would it have any use without that?
    Either P or 'P - nothing is possible P.
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    of course there are different forms of construal of the possibility operator, but you have to start somewhere if you want to do aletheic logic.
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    I know nothing about formal logic, but as far as I can tell you're questioning whether the possibility is a meaningfull predicate--am I right? It obviously doesn't behave in the same way as normal predicates; but could not propositions about possibility be reduced to conditional propositions about existence?

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Updated: July 23, 2012
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