Subset
A subset is a set which all the elements are contained in another set. Another way, "Every element in \(A\) is in \(B\)".
\(A\) is a subset of \(B\) means: $$ \text{If }x\in A, \text{ then } x\in B $$ We write: $$ A\subseteq B $$
A subset is a set which all the elements are contained in another set. Another way, "Every element in \(A\) is in \(B\)".
\(A\) is a subset of \(B\) means: $$ \text{If }x\in A, \text{ then } x\in B $$ We write: $$ A\subseteq B $$