In combinatorics, a difference set is a subset of a group such that the order of is, the size of is, and every nonidentity element of can be expressed as a product of elements of in exactly ways.
Read more about Difference Set: Basic Facts, Multipliers, Parameters, Known Difference Sets, Application, Generalisations
Famous quotes containing the words difference and/or set:
“The difference between faith and superstition is that the first uses reason to go as far as it can, and then makes the jump; the second shuns reason entirely—which is why superstition is not the ally, but the enemy, of true religion.”
—Sydney J. Harris (1917–1986)
“Nothing in medieval dress distinguished the child from the adult. In the seventeenth century, however, the child, or at least the child of quality, whether noble or middle-class, ceased to be dressed like the grown-up. This is the essential point: henceforth he had an outfit reserved for his age group, which set him apart from the adults. These can be seen from the first glance at any of the numerous child portraits painted at the beginning of the seventeenth century.”
—Philippe Ariés (20th century)