itself.
.
Count the number of true relations among
these.
Let U be the single-element set { 1 }. There are two subsets, the empty set φ and { 1 } itself. If A and B are arbitrary subsets of U, there are four possible relations of the form "A is subset of B". Count the number of true relations among these.
Sets and Set Inclusion are investigated. The solution is detailed and well presented.