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1 does not equal "1 of <something>", the latter is a concrete example only (and as mentioned the quantity error, you would have 2 drops of water if the volume of 1 drop stays consistent).

1 is an abstract concept applied to many things that share this "singleton property".

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If you think about it really hard (since we are at abstract) "1 of <something>" is never equal to any other "1 of <something>"

Nothing is equal in universe. Everything is its own thing. 1 drop of water != another 1 drop of water. Two different entities.

Only in math we have 1=1 or 1+1=2. And math doesn't work for universe, it works for science.

I disagree, computation has equality, unless you think computer files are not real. Two computations can be equal, and as far as we know we are leveraging this property of the universe. Electrons move and produce patterns which have equality and gives rise to computer state and thus equality of values, not to mention electrons themselves must be indistinguishable given they behave the same.

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