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Order Separability of Free Products with Amalgamated Subgroup / Edynak V.V. // Vestnik Moskovskogo Universiteta. Seriya 1. Matematika. Mekhanika. 2011. № 5. P. 6-14 [Moscow Univ. Math. Bulletin. Vol. 66, N 5, 2011.]. The order separability is proved for the free product of two free groups with the amalgamated maximal cyclic subgroups.
Key words: free products, residual properties.
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