Question: Choosing integers from a set!


    I have this problem and I cannot find a way to perform this search that I want it to. 

I have a set consisting of integers and fractions.  What maple code can I use to select only the integers out of this set.


For example:


I want to choose only the integers out of this I need to obtain a set with D:= {1,9,8,10,11}.


How do I do so?

Any help will be appreciated.



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