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T T T T F F F F 14. The positive irrationals are closed under addition. 15. The negative real numbers are closed under multiplication. 16. Let A and B be sets then for all x, x E A ⇒x E B if, and only if A C B Let A and B be sets then for all x, x A x ‡ B if, and only if A B 17.

T T T T F F F F 14. The positive irrationals are closed under addition. 15. The negative real numbers are closed under multiplication. 16. Let A and B be sets then for all x, x E A ⇒x E B if, and only if A C B Let A and B be sets then for all x, x A x ‡ B if, and only if A B 17.

Advanced Engineering Mathematics
Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
Problem 1RQ
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T T T T F F F F 14. The positive irrationals are closed under addition. 15. The negative real numbers are closed under multiplication. 16. Let A and B be sets then for all x, x E A ⇒x E B if, and only if A CB Let A and B be sets then for all x, x ‡ A ⇒x & B if, and only if A & B 17.
Transcribed Image Text:T T T T F F F F 14. The positive irrationals are closed under addition. 15. The negative real numbers are closed under multiplication. 16. Let A and B be sets then for all x, x E A ⇒x E B if, and only if A CB Let A and B be sets then for all x, x ‡ A ⇒x & B if, and only if A & B 17.
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