If it's possible for a cat to be alive and dead at the same time, or for a

If it's possible for a cat to be alive and dead at the same time, or for a

If it's possible for a cat to be alive and dead at the same time, or for a particle to be in two places at the same time, would that show there are at least some things about which one couldn't rely on "Either P or not P" as a sound step in reasoning?

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