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:

“... if the Settlement seeks its expression through social activity, it must learn the *difference* between mere social unrest and spiritual impulse.”

—Jane Addams (1860–1935)

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—Dwight D. Eisenhower (1890–1969)

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