Assume that d ≥ 4. Then there exists a d-dimensional dual hyperoval in PG(d + n, 2) for d + 1 ≤ n ≤ 3d -7.
On a conjecture in D-optimal designs with n ≡ 0 mod 4
✍ Scribed by Chun-Hsien Li; Suh-Yuh Yang
- Publisher
- Elsevier Science
- Year
- 2005
- Tongue
- English
- Weight
- 204 KB
- Volume
- 400
- Category
- Article
- ISSN
- 0024-3795
No coin nor oath required. For personal study only.
✦ Synopsis
This paper is devoted to analyze a conjecture in D-optimal designs proposed by Bora-Senta and Moyssiadis [An algorithm for finding exact D-and A-optimal designs with n observations and k two-level factors in the presence of autocorrelated errors, J. Combin. Math. Combin. Comput. 30 (1999) 149-170] in 1999. With the aid of techniques of differential calculus, Hadamard's and Fisher's inequalities for symmetric and positive definite matrices, we prove that the conjecture is true for n autocorrelated observations and k two-level factors with n = 4ν and k = 2.
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