Geodesic
Subregular characters of the group $\mathrm{UT}(n,\mathbb R)$
Zapiski Nauchnykh Seminarov POMI, Problems in the theory of representations of algebras and groups. Part 25, Tome 414 (2013), pp. 138-155 
A. N. Panov; E. V. Suray. Subregular characters of the group $\mathrm{UT}(n,\mathbb R)$. Zapiski Nauchnykh Seminarov POMI, Problems in the theory of representations of algebras and groups. Part 25, Tome 414 (2013), pp. 138-155. http://geodesic.mathdoc.fr/item/ZNSL_2013_414_a8/
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Voir la notice du chapitre de livre provenant de la source Math-Net.Ru

The formulas for subregular characters of the unitriangular Lie group are obtained. The supports of regular and subregular characters are described in terms of the orbit method.

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[2] A. A. Kirillov, Lektsii po metodu orbit, Nauchnaya kniga, Novosibirsk, 2002

[3] M. V. Ignatev, “Subregulyarnye kharaktery unitreugolnoi gruppy nad konechnym polem”, Fund. i prikl. matem., 13:5 (2007), 103–125 ; arXiv: 0801.3079 | MR | Zbl

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