We define a group theoretical invariant, denoted by s G , as a solution of a certain set covering problem and show that it is closely related to chl(G), the cohomology length of a p-group G. By studying s G we improve the known upper bounds for the cohomology length of a p-group and determine chl(G)
✦ LIBER ✦
On Johnson′s Example of a Nonconvex Chebyshev Set
✍ Scribed by M. Jiang
- Publisher
- Elsevier Science
- Year
- 1993
- Tongue
- English
- Weight
- 208 KB
- Volume
- 74
- Category
- Article
- ISSN
- 0021-9045
No coin nor oath required. For personal study only.
✦ Synopsis
The note identifies two errors in the proof of the Chebyshevity of Johnson's example of a nonconvex subset of the inner product space of all finite sequences. Corrections are given. C: 1993 Academic Press. Ins.
📜 SIMILAR VOLUMES
Set Covering and Serre's Theorem on the
✍
Ergün Yalçin
📂
Article
📅
2001
🏛
Elsevier Science
🌐
English
⚖ 150 KB
On a Collection of Classes in Ackermann'
✍
Klaus Gloede
📂
Article
📅
1980
🏛
John Wiley and Sons
🌐
English
⚖ 306 KB
👁 1 views
Testing Nanomaterials of Unknown Toxicit
✍
A. Elder; H. Yang; R. Gwiazda; X. Teng; S. Thurston; H. He; G. Oberdörster
📂
Article
📅
2007
🏛
John Wiley and Sons
🌐
English
⚖ 438 KB
Genetic composition of Brazilian populat
✍
Tulio C. Lins; Rodrigo G. Vieira; Breno S. Abreu; Dario Grattapaglia; Rinaldo W.
📂
Article
📅
2009
🏛
John Wiley and Sons
🌐
English
⚖ 108 KB
👁 1 views
## Abstract Ancestry informative SNPs can be useful to estimate individual and population biogeographical ancestry. Brazilian population is characterized by a genetic background of three parental populations (European, African, and Brazilian Native Amerindians) with a wide degree and diverse patter
ChemInform Abstract: On the Reactivity o
✍
Gregory L. Smith; Gary J. Schrobilgen
📂
Article
📅
2009
🏛
John Wiley and Sons
⚖ 24 KB
👁 1 views
Effects of somatostatin on oesophageal v
✍
S. W. Hosking; A. G. Johnson; S. A. Jenkins; J. N. Baxter; W. A. Corbett; R. Shi
📂
Article
📅
1986
🏛
John Wiley and Sons
🌐
English
⚖ 126 KB
👁 1 views