Geodesic
On reduction modulo a prime of fields of modular functions
Izvestiya. Mathematics, Tome 2 (1968) no. 6, pp. 1213-1222 
I. I. Pyatetskii-Shapiro. On reduction modulo a prime of fields of modular functions. Izvestiya. Mathematics, Tome 2 (1968) no. 6, pp. 1213-1222. http://geodesic.mathdoc.fr/item/IM2_1968_2_6_a2/
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     title = {On reduction modulo a prime of fields of modular functions},
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Voir la notice de l'article provenant de la source Math-Net.Ru

We study the reduction modulo $p$ of a subring of the field of modular functions $K(p^\infty)$ modulo $p$. We obtain a generalization of a known congruence of Weber.

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