✦ LIBER ✦
Distance-regular Graphs withbi=cd−iand Two P-polynomial Structures
✍ Scribed by Tomoya Koishi
- Publisher
- Elsevier Science
- Year
- 1997
- Tongue
- English
- Weight
- 105 KB
- Volume
- 18
- Category
- Article
- ISSN
- 0195-6698
No coin nor oath required. For personal study only.
✦ Synopsis
Let be a distance-regular graph with b i = c d-i for all 1 ≤ i ≤ r. We show that if the diameter d ≤ 3r + 2 and a d = 0, then k d = a d + 1 and has two P-polynomial structures.