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    Ahhh! Maths Union Sets problem!! Grrr

    I'm doingf this exercise in a complementary textbook and i'm so idiotic i don't know how to do this question.
    It's the last one in the chapter, maybe indicating it is difficult but i don't understand!
    What is
    (0,1) U {1,2} U [2,3]

    Note the 3 dif. brackets... it's why i can't do this Q.
    Please help and explain!!

    Where U = Union = Or
    So the first brackets are open sets, the middle a finite and the third a closed. I don't understand how that influences, cheers!

    please quote me when you erply¬!!! thanks
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    (Original post by lilpenguin)
    Ahhh! Maths Union Sets problem!! Grrr

    I'm doingf this exercise in a complementary textbook and i'm so idiotic i don't know how to do this question.
    It's the last one in the chapter, maybe indicating it is difficult but i don't understand!
    What is
    (0,1) U {1,2} U [2,3]

    Note the 3 dif. brackets... it's why i can't do this Q.
    Please help and explain!!

    Where U = Union = Or
    So the first brackets are open sets, the middle a finite and the third a closed. I don't understand how that influences, cheers!

    please quote me when you erply¬!!! thanks
    Drawing the real line and marking the unions would help with this question.

    (0,1) means all the real number from 0 to 1 not including 0 and 1. But the element '1' is included in the union so (0,1) will become (0,1]

    Now [2,3] means all the real number from 2 to 3 including 2 and 3. The element '2' has been added to the union but it's already contained in [2,3] so we can ignore it.

    What do you end up with?
 
 
 
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