Disjoint union: Difference between revisions
{0,1} used later
RhubarbJayde (talk | contribs) No edit summary |
({0,1} used later) |
||
Line 1:
The disjoint union of a collection of sets is a set so that each element of the collection injects into the disjoint union, and so that the collection of images of each element of the collection creates a partition of the disjoint union. For example, the disjoint union of disjoint sets is just their union, while, e.g. the disjoint union of \(\{1,2\}\) and \(\{2,3\}\) could be taken to be \(\{(
|