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I assume by Z Q R you mean the sets , and where is the set of integers, is the set of rationals (numbers that can be written as a/b with a and b in ) and is the set of every single real number you can think of.

If this is the case all they really mean for -15 in each of them is that:

-for ℤ, the numbers directly above or below is -14 or -16

-for ℚ, the numbers directly above or below is an extremely small amount above or below -15 to explain what i mean better -15 could be written as -15/1 and a number just above could be -15,000,000/1,000,001 but you can decrease the difference between that number and -15 by multiplying top and bottom by multiples of 10.

-for ℝ, the numbers directly above or below -15 differ by an infinitely small amount and are essentially the same number as -15.

Except for this I can't see how the different sets would mean anything for -15 except for operations where the operator would have to be an integer or rational to keep it in and respectively. For it doesn't matter what the operator is so long as it is not imaginary or complex.

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Q: What do the symbols Z Q R mean for -15?
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