hello , I don't understand the meaning of the next definition , so , I hope that you can make it easy to understand it for me(adsbygoogle = window.adsbygoogle || []).push({});

definition

if G is an arbitrary group and ∅≠S⊆G , then ,the symbol (s) will represent the set

(S) = ∩ { H∖S ⊆ H : H is a subgroup of G }

can you give me some examples about this definition ?

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# What does this definition mean ?

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