Geodesic
Ahmed--Rao Bases
Matematičeskie zametki, Tome 75 (2004) no. 6, pp. 834-840.

Voir la notice de l'article provenant de la source Math-Net.Ru

For $N= 2^s$, in the space of complex-valued $N$-periodic functions of an integer argument, we construct s orthogonal bases such that the elements of the $r$th basis, where $r\in\{1,\dots,s\}$, take $2^r$ values of uniformly distributed on the unit circle in the complex plane. 
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A. V. Korovkin; V. N. Malozemov. Ahmed--Rao Bases. Matematičeskie zametki, Tome 75 (2004) no. 6, pp. 834-840. http://geodesic.mathdoc.fr/item/MZM_2004_75_6_a2/

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