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Subjects>Math>Basic Math

Is natural numbers a closed set under subtraction?

Anonymous

∙ 12y ago

Updated: 4/28/2022

No.

A set is closed under subtraction if when you subtract any two numbers in the set, the answer is always a member of the set.

The natural numbers are 1,2,3,4, ... If you subtract 5 from 3 the answer is -2 which is not a natural number.

Wiki User

∙ 12y ago

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Q: Is natural numbers a closed set under subtraction?

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Continue Learning about Basic Math

Are rational numbers closed under subtraction?

Yes. They are closed under addition, subtraction, multiplication. The rational numbers WITHOUT ZERO are closed under division.

Is the set of irrational numbers closed under subtraction?

No; here's a counterexample to show that the set of irrational numbers is NOT closed under subtraction: pi - pi = 0. pi is an irrational number. If you subtract it from itself, you get zero, which is a rational number. Closure would require that the difference(answer) be an irrational number as well, which it isn't. Therefore the set of irrational numbers is NOT closed under subtraction.

Is the sum of rational numbers always rational?

Yes. In general, the set of rational numbers is closed under addition, subtraction, and multiplication; and the set of rational numbers without zero is closed under division.

Under which operation are natural numbers closed?

Addition.

Are prime numbers closed under subtraction?

No.

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