(adsbygoogle = window.adsbygoogle || []).push({}); is empty set part of every set??

you have a power set of s

represented by p(s)

and s is { x is integer and either x=<-2 or x>=5}

and you have another set d = {{-3 -2 1}, {4}, {6, 7}, {-5, 6, 9}}

when you are asked for intersection of p(s) and d in a plain maths question

am I meant to include { } the empty set as well since it is a subset of everyset???

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# Is empty set part of every set?

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