Where it gets hard is figuring out exactly what on earth "explores every possible path" means. (Beyond being a figure of speech, it's not clear that it means anything.)https://twitter.com/bgreene/status/1089884272134103041 …
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It's encouraging, though, that Wiener managed to give precise meaning to a certain kind of "integral over all paths" -- and it may be profoundly significant that Wiener's approach often permits (via analytic continuation) a rather indirect definition for the Feynman integral.
At bottom, though, what makes the microworld so extremely strange is that the logic governing true statements that refer to its denizens is so profoundly different from everyday classical logic. "And," "or," and "not" all have essentially different meanings in the quantum realm.
Indeed - and so does "is". It makes more sense to me to recognize that than to extract "every path at once" from a mathematical formalism.
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