Proposition 9: Every nonempty open set is the disjoint union of a countable collection of open intervals. Using Proposition 9 to write a non empty open set & as the disjoint countable union. = (akibk) k=1 Prove that it is closed then we must have Ox=-∞o and if I bk=00 for every k, so that + = IR (and there is though this is inelevant. only. Hint: The answer is the empty set and R! one b

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Q: السؤال 12 Let T-{1,33. 1 1 1 .}, then T is countably infinite set. 2 in صواب ihi

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Q: @ (А-В)- С 3 (А - С) - В

A: Introduction :

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