I determine the boundary of myself by observing which objects are not-me. Defining a thing or concept means specifying a boundary around it, the outside of the boundary corresponding to the anti-definition. "Nothing" is defined in defining "something". In essence, a definition is a boundary between two concepts. You can't define a boundary around what is meant by "something" without outlining what is meant by "nothing". How can you define a boundary with an inside but no outside. That is what we mean when we say that they define each other and that if one exists, they must both exist. The concept of nothing shouldn't be any more difficult than no-money or no-apples. It's just more general of a concept. Perhaps we should clarify which type of nothing we're talking about: Is "nothing" the opposite of "anything", "everything", "something"?Is the only way we know that consciousness exists the result of its contrast to unconsciousness?
Also, it seems to me that in claiming that nothing does not exist you assume that nothing exists. If nothing exists, it is something. If it does not exist, it is nothing, and thus nothing exists. Saying that nothing exists may be a paradox, but saying that it does not exist is also a paradox. At least it seems that way to me.
Why can nothing and something not exist simultaneously? Why can there not be something in some places and times, and nothing in other places in times. There is enough spacetime for both to have a time and place.There can't ever be NOTHING if there is something
I agree that the particle physics/quantum fluctuations example was not a good one. How about the big bang then. I know it's a highly speculative event but, as far as I know, the consensus is that even time and space were nonexistent "beforehand".
EDIT: I think this example opens another can of worms. :?



was doing in the quotes of the OP.