Question: Problem # 6 . Justify your answer to each of the following true / false statements: 1 . Every subset of a regular sd is

Problem # 6.Justify your answer to each of the following true/false statements:
1. Every subset of a regular sd is regular
2. Tlw in1ersection of a regular set with a finite sd is regular
3. The union of a regular sd with an infinite set is regular
4. The posit.iv<\ closure of a regular set is regular

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