\subsetThe symbol \subset is used to denote that one set is a subset of another set. In set theory, if A \subset B, it means that every element of set A is also an element of set B. This relation is fundamental in understanding the hierarchy and relationships between different sets.
Set A is a subset of set B, meaning all elements of A are also in B.
A \subset BThe set containing elements 1 and 2 is a subset of the set containing elements 1, 2, 3, and 4.
\{1, 2\} \subset \{1, 2, 3, 4\}The empty set is a subset of any set A.
\emptyset \subseteq A