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Why regular languages are not closed under infinite union?

Anonymous

∙ 14y ago

Updated: 10/16/2024

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Q: Why regular languages are not closed under infinite union?

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Continue Learning about Math & Arithmetic

Is a rational number closed under addition?

No. A number cannot be closed under addition: only a set can be closed. The set of rational numbers is closed under addition.

When are complex numbers closed under addition?

Quite simply, they are closed under addition. No "when".

Are polynomial expressions closed under subtraction?

Yes they are closed under multiplication, addition, and subtraction.

Are rational numbers closed under division multiplication addition or subtraction?

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.

What is a set of rational numbers not closed under?

It is not closed under taking square (or other even) roots.

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