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Rational numbers are closed under addition, subtraction, multiplication. They are not closed under division, since you can't divide by zero. However, rational numbers excluding the zero are closed under division.
No, the natural numbers are not closed under division. For example, 2 and 3 are natural numbers, but 2/3 is not.
No.
no
Integers are closed under division I think o.o. It's either counting numbers, integers or whole numbers . I cant remember :/
They are closed under all except that division by zero is not defined.
The whole numbers are not closed under division! The statement is false since, for example, 2/3 is not a whole number.
Yesss.
Yes. They are closed under addition, subtraction, multiplication. The rational numbers WITHOUT ZERO are closed under division.
No, it is not. Division by zero (a rational) is not defined.
Yes. The set of real numbers is closed under addition, subtraction, multiplication. The set of real numbers without zero is closed under division.
The set of rational numbers is closed under all 4 basic operations.