On the value of the fifth maximal projection constant
On the value of the fifth maximal projection constant
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关于第五最大投影常数的值
DOI:
10.1016/j.jfa.2022.109634
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发表时间:
2022
影响因子:
1.7
通讯作者:
B. Deregowska, M. Fickus
中科院分区:
文献类型:
--
作者:
B. Deregowska, M. Fickus
Let λ (m) denote the maximal absolute projection constant over real m-dimensional subspaces. This quantity is extremely hard to determine exactly, as testified by the fact that the only known value of λ (m) for m> 1 is λ (2)= 4/3. There is also numerical evidence indicating that λ (3)=(1+ 5)/2. In this paper, relying on a new construction of certain mutually unbiased equiangular tight frames, we show that λ (5)≥ 5 (11+ 6 5)/59≈ 2.06919. This value coincides with the numerical estimation of λ (5) obtained by BL Chalmers, thus reinforcing the belief that this is the exact value of λ (5).
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影响因子:
1.2
作者:
A. Castejón;G. Lewicki;Alberto Martín
通讯作者:
Alberto Martín
影响因子:
1.7
作者:
B. Chalmers;G. Lewicki
通讯作者:
G. Lewicki
影响因子:
1.3
作者:
S. Foucart;Lesław Skrzypek
通讯作者:
Lesław Skrzypek
影响因子:
1
作者:
H. König
通讯作者:
H. König
DOI:
10.1007/s10623-021-00937-w
发表时间:
2020-10
期刊:
Designs, Codes and Cryptography
影响因子:
--
作者:
M. Fickus;Joseph W. Iverson;J. Jasper;E. King
通讯作者:
M. Fickus;Joseph W. Iverson;J. Jasper;E. King