An asymmetric binary covering code of length n and radius R is a subset C of the n-cube Q n such that every vector x 2 Q n can be obtained from some vector c 2 C by changing at most R 1's of c to 0's, where R is as small as possible. K ΓΎ Γ°n; RΓ is defined as the smallest size of such a code. We show
Binary codes and caps
β Scribed by Aiden A. Bruen; Lucien Haddad; David L. Wehlau
- Publisher
- John Wiley and Sons
- Year
- 1998
- Tongue
- English
- Weight
- 177 KB
- Volume
- 6
- Category
- Article
- ISSN
- 1063-8539
No coin nor oath required. For personal study only.
β¦ Synopsis
The connection between maximal caps (sometimes called complete caps) and certain binary codes called quasi-perfect codes is described. We provide a geometric approach to the foundational work of Davydov and Tombak who have obtained the exact possible sizes of large maximal caps. A new self-contained proof of the existence and the structure of the largest maximal nonaffine cap in PG(n, 2) is given. Combinatorial and geometric consequences are briefly sketched. Some of these, such as the connection with families of symmetric-difference free subsets of a finite set will be developed elsewhere.
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The asymptotic value as nPR of the number b(n) of inequivalent binary n-codes is determined. It was long known that b(n) also gives the number of nonisomorphic binary n-matroids.