ABSTRACT
Set membership is indicated by the∈ symbol, and set exclusion (is not a member) by ∉.
Examples
a [ {a, b, c}
d {a, b, c}
The set A is a subset of set B, denoted A⊆ B, if and only if (iff) every member of A is also a member of B.
Set membership is indicated by the∈ symbol, and set exclusion (is not a member) by ∉.
Examples
a [ {a, b, c}
d {a, b, c}
The set A is a subset of set B, denoted A⊆ B, if and only if (iff) every member of A is also a member of B.