Geodesic
On the convergence of series of weakly multiplicative systems of functions
Sbornik. Mathematics, Tome 18 (1972) no. 3, pp. 361-372 Cet article a éte moissonné depuis la source Math-Net.Ru

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A system of measurable functions $\{\varphi_k\}$ defined on a measurable space is called weakly multiplicative if it satisfies the relations $$ \int_X\varphi_{k_1}\varphi_{k_2}\dots\varphi_{k_p}\,d\mu=0\quad(\forall p\geqslant2,\ k_1<k_2<\dots<k_p). $$ In this paper the convergence in the metric of $L_p$ and a.e. is investigated for series of weakly multiplicative system of functions. One of the results is: {\it If $\{\varphi_k\}$ is weakly multiplicative and $\sup_k\|\varphi_k\|_p\leqslant M$ for some $p>2,$ then any series $\sum c_k\varphi_k$ with coefficients in $l_2$ converges unconditionally a.e. and in $L_p$}. For $p=2n$, instead of weak multiplicativity it is sufficient to require the condition $\int_X\varphi_{k_1}\dots\varphi_{k_{2n}}\,d\mu=0$ ($\forall k_1<\dots). Bibliography: 13 titles. 
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     author = {V. F. Gaposhkin},
     title = {On the convergence of series of weakly multiplicative systems of functions},
     journal = {Sbornik. Mathematics},
     pages = {361--372},
     year = {1972},
     volume = {18},
     number = {3},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1972_18_3_a0/}
}
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V. F. Gaposhkin. On the convergence of series of weakly multiplicative systems of functions. Sbornik. Mathematics, Tome 18 (1972) no. 3, pp. 361-372. http://geodesic.mathdoc.fr/item/SM_1972_18_3_a0/

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