https://en.wikipedia.org/wiki/Partition_of_a_set?wprov=sfla1
The sets in [partition] P are called the blocks, parts, or cells, of the partition.
The number of cells in partition is >= 1.
https://en.wikipedia.org/wiki/Partition_of_a_set?wprov=sfla1
The sets in [partition] P are called the blocks, parts, or cells, of the partition.
The number of cells in partition is >= 1.