==Coding theory== The Hamming scheme and the Johnson scheme are of major significance in classical coding theory. In coding theory, association scheme theory is mainly concerned with the distance of a code. The linear programming method produces upper bounds for the size of a code with given minimum distance, and lower bounds for the size of a des...
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http://en.wikipedia.org/wiki/Association_scheme
(from the article `combinatorics`) Given objects 1, 2, , , a relation satisfying the following conditions is said to be an -class partially balanced association scheme:
Found on
http://www.britannica.com/eb/a-z/a/115
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