Geodesic
Point differentiations of algebras of generalized analytical functions
Proceedings of the Yerevan State University. Physical and mathematical sciences, no. 2 (1990), pp. 19-27 
L. M. Hakobian. Point differentiations of algebras of generalized analytical functions. Proceedings of the Yerevan State University. Physical and mathematical sciences, no. 2 (1990), pp. 19-27. http://geodesic.mathdoc.fr/item/UZERU_1990_2_a2/
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     title = {Point differentiations of algebras of generalized analytical functions},
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Voir la notice de l'article provenant de la source Math-Net.Ru

For any natural $k$ (which can also be $\infty$) a quasimaximal semi-group $\Gamma_0$ has been constructed on the half axis, such that the space of point differentiations in non-idempotent characters of $\Gamma_0$ of the algebra $A(\Gamma_0)$ of generalized analytical functions be $k$-dimensional.

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