Subset

sets can be subsets (or equal) of another set if all elements of a Set is in another Set.

Example:

S⊂{3,5,1982549,67}\begin{gather*} S\subset\{3,5,1982549,67\} \end{gather*}

We have a line underneath to show it could be a subset OR equal

S⊆{3,5,1982549}\begin{gather*} S\subseteq\{3,5,1982549\} \end{gather*}