I need help with Math problem?

Posted on 2015-09-10 13:25:00 in Math by LURA

Question: Let A = {positive intergers}, B = {negative intergers}, C ={multiples of 2} and D {multiples of 3}.Describe the following sets with mathematical symbols:
a) A U B
For a) I was thinking this way:

A U B = {x ? IN | x ? A or x? B}.

I am not sure if correct or completely wrong

Thanks for helping.

If interested here are the next ones, but I am only asking to give me a hint on the first one.
b) A U B U C U D
c) A (inverse U) B
d)C (inverse U) B
e) A (inverse U)(C U D)

Thanks you

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