Q: Is it possible to take the union of two closed intervals and get an open interval?

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No.

3/3-x

"Densest" is not really an applicable term here. I take it you mean "has the highest cardinality?" In this cast there are an infinite number of these. A theorem states (I forget the name) that a subset of a set can have at most the same cardinality of that set. So we need a set S such such that S ⊆ ℝ and |S| ≈ |ℝ|. Like I said, many sets fit this description, i.e. ℝ itself, any open or closed interval on ℝ like [1,16) or (-∞, 3), any union of any subset of ℝ and an open or closed interval on ℝ such as (12, ∞) ∪ {e}. I suppose that there are many types that I may be forgetting, but I hope you understand. =]

Union.

A diagram representing mathematical or logical sets pictrorially as circles or closed curves whithin an enclosing. Rectangle common elements of sets being represented by the areas of overlal amongs the circles and two things being comper or being similar

Related questions

No.

No, it is not.

A union closed shop is a workplace in which only union workers are allowed and to work and an open shop allows non union workers

This question needs to be rewritten. I can think of union terms for "open/closed" shops, but I am not sure this is what you want.

X = (-infinity, 0) U (0, infinity) The above is read as X equals negative infinity, comma zero, union, zero, comma infinity on an open interval (By the way, this interval is made up of two intervals). A parenthesis by a value indicates it is not included. This means X could equal anything between -infinity and 0 and X can equal anything between 0 and infinity. X can not equal -infinity. X can not equal 0. X can not equal infinity. The interval is open because none of the starting or ending values can be a value of X (It's a parenthesis by all the starting and ending values). There is a parenthesis by 0 because 0 is not a possible value of X (the question says so). There is a parenthesis by -infinity and infinity because they are not real numbers. So whether either of them is included in the answer, they always have a parenthesis by them. If a number was included in an interval, there would be a square bracket by it, like this: [ or ]. If the starting number and the ending number on the interval is included then the interval is closed.

In a closed shop, union membership is required. The employer agrees to hire union members only. The employees must remain members of the union in order to remain employed.

closed shop

there are no western union open we went to almost all manila branches and sm establishment and they are closed

region

3/3-x

The closed-shop policy, which was outlawed by the Taft-Hartley Act in 1947, forced workers to join the union in order to be hired at a company and to remain a union member in order to continue employment.

Closed shop. Agency shop. Open shop. Union shop.