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The other way around.Right. How would we be able to compare, say, the sets {1, 2, 3, ...} and {-1, -2, -3, ...} concerning "size" by relying on "set inclusion"? Or, say, {1, 2, 3, ...} and {1.5, 2.5, 3.5, ...} etc.
It's set.inclusion which stops working as a guide to size.
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