Basic Modal Logic

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Robert Bull, Krister Segerberg
Dov Gabbay, F. Guenthner (eds.)
Handbook of Philosophical Logic, pages 1–88
Springer Netherlands, Dordrecht

It is popular practice to borrow metaphors between different fields of thought. When it comes to evaluating modal logic it is tempting to borrow from the anthropologists who seem to agree that our civilization has lived through two great waves of change in the past, the Agricultural Revolution and the Industrial Revolution. Where we stand today, where the world is going, is difficult to say. If there is a deeper pattern fitting all that is happening today, then many of us do not see it. All we know, really, is that history is pushing on.