Search results
Results from the WOW.Com Content Network
This implies that a singleton is necessarily distinct from the element it contains, [1] thus 1 and {} are not the same thing, and the empty set is distinct from the set containing only the empty set. A set such as { { 1 , 2 , 3 } } {\displaystyle \{\{1,2,3\}\}} is a singleton as it contains a single element (which itself is a set, but not a ...