<Li> The symbols Ø and `` ∅ '' ( U + 2205 ) are used in mathematics to refer to the empty set . </Li>
<Li> The symbols Ø and `` ∅ '' ( U + 2205 ) are used in mathematics to refer to the empty set . </Li>
what does a 0 with a line through it mean in math
what does a 0 with a line through it mean in math
empty set
empty set