I’d like to explore necessity.
I’ll start by saying I know I don’t understand it.
I’ll take a quote from Doug to get the ball rolling.
I don’t really know how to make any normal sense of a world in which everything happens necessarily—
But I don’t think this is a real possibility.[/quote:1ded36807c]
In my mind in the actual world everything does happen necessarily.
But I don’t have a problem believing their are many possible worlds.
Is this a contradiction?
[color=darkblue:1ded36807c]In the most common interpretation of modal logic, one considers "all logically possible worlds". If a statement is true in all possible worlds, then it is a necessary truth. If a statement happens to be true in our world, but is not true in all possible worlds, then it is a contingent truth. A statement that is true in some possible world (not necessarily our own) is called a possible truth.
Whether this "possible worlds idiom" is the best way to interpret modal logic, and how literally this idiom can be taken, is a live issue for metaphysicians. For example, the possible worlds idiom would translate the claim about Bigfoot as "There is some possible world in which Bigfoot exists". To maintain that Bigfoot’s existence is possible, but not actual, one could say, "There is some possible world in which Bigfoot exists; but in the actual world, Bigfoot does not exist". But it is unclear what it is that making modal claims commits us to. Are we really alleging the existence of possible worlds, every bit as real as our actual world, just not actual? David Lewis made himself notorious by biting the bullet, then asserting that possible worlds are as real as our own. This position is called "modal realism". Unsurprisingly, most philosophers decline to sign on to this ontologically extravagant doctrine, preferring to seek various ways to paraphrase away the ontological commitments implied by our modal claims.[/color:1ded36807c]
There are possible worlds in which big foot exists but in the actual world he doesn’t.
I view other possible worlds as imaginary not real. Although they are imaginary, I think they could exist but don’t or if they do it makes no difference to us as we are in the actual world.
I’m sure I seem to be muddled up, well I think I am.