Mathematics > sets-relations-and-functions > Relations And Functions

All elements of $A_i$ are related to each other, for all $i$

$A_i \cap A_j \ne \phi, i \ne j$

$x \in A_i$ and $x \in A_j \Rightarrow A_i = A_j$

$\bigcup_{i=1}^n A_i = A$