no
Chat with our AI personalities
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.
There cannot be a counterexample since the assertion is true. This requires you to accept the true fact that the terminating decimal 1.25, for example, is equivalent to the repeating decimal 1.25000... (or even 1.24999.... ).
no
The whole numbers are not closed under division! The statement is false since, for example, 2/3 is not a whole number.
No, it is not. Division by zero (a rational) is not defined.