We write $a \in A$ to indicate that the object $a$ is an **element**, or a distinct member, of the set $A$. We also say that $a$ belongs to $A$. If the object $a$ is a distinct member that belongs to the set $A$, The [[Logical Equivalence|equivalent]] converse of this relation $A \ni a$ is read "$A$ contains $aquot; The **[[Logical Operations#Negation not|negation]]** of this relation $a \notin A$, is read as "$a$ is *not* an element of $Aquot;, or "$a$ does *not* belong to $Aquot;