How do you put combine two ranges into a single formula?

Question

y<=-1
y>1

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Answer 1 · 2018-05-21T09:39:52

#y in (-oo, -1]uu(1,+oo)#

Assume #y in RR#

We are told that: #y<=-1 or y>1#

That means that #y# can take all real values less than or equal to #-1# and all real values greater than #+1#

We can express this in interval notation as:

#y in (-oo, -1]uu(1,+oo)#