Geodesic
On the problem of a finite basis of identities in groups
Izvestiya. Mathematics, Tome 4 (1970) no. 2, pp. 381-389 Cet article a éte moissonné depuis la source Math-Net.Ru

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This paper contains a proof that the set of varieties of groups has the cardinality of the continuum. This implies the existence of an infinite system of group identities not equivalent to any finite system. 
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A. Yu. Ol'shanskii. On the problem of a finite basis of identities in groups. Izvestiya. Mathematics, Tome 4 (1970) no. 2, pp. 381-389. http://geodesic.mathdoc.fr/item/IM2_1970_4_2_a6/

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