## Modal Logic and Quantum Mechanics

And here I am again. Yes this is me today. It’s too late to hide now.

Today I’d like to talk about modal logic. My introduction to symbolic logic and the predicate calculus began in a philosopy & logic class in the late Seventies. But that was merely true-false logic.

Modal logic is a generalization of simple logic, going beyond whether statements are true or not, but whether it is *possible* for them to be true, or *necessary *that they be true.

The combination of these operators yields some interesting theorems:

If this sounds more like philosophy (epistemology) as well as Quantum Mechanics, then perhaps it is. For example, one way to state the principle of “mixed states” such as we find in the “uncollapsed state vectors” might be the following:

Conversely, if one passes a beam of spinning particles such as electrons through a magnetic field so as to cause the “spin up” particles to deflect one way and the “spin-down” particles to deflect the other way, then the states are no longer mixed. In this case, looking at either one of the diverged result beams, we find that it is no longer possible to observe both “up” and “down” states:

More on this later –MRK

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