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20E06 Free products, free products with amalgamation, Higman-Neumann-Neumann extensions, and generalizations (6 articles)

• Ke, Wen-Fong; Meyer, Johannes H.: Are zero-symmetric simple nearrings with identity equiprime?. (English). Czechoslovak Mathematical Journal, vol. 74 (2024), issue 4, pp. 1289-1298
• Ke, Wen-Fong; Meyer, Johannes H.; Pilz, Günter F.; Wendt, Gerhard: On zero-symmetric nearrings with identity whose additive groups are simple. (English). Czechoslovak Mathematical Journal, vol. 74 (2024), issue 3, pp. 869-880
• Mantika, Gilbert; Temate-Tangang, Narcisse; Tieudjo, Daniel: The Ribes-Zalesskii property of some one relator groups. (English). Archivum Mathematicum, vol. 58 (2022), issue 1, pp. 35-47
• Gelbukh, Irina: Co-rank and Betti number of a group. (English). Czechoslovak Mathematical Journal, vol. 65 (2015), issue 2, pp. 565-567
• Ateş, Firat; Çevik, A. Sinan: (Cyclic) subgroup separability of HNN and split extensions. (English). Mathematica Slovaca, vol. 57 (2007), issue 1, pp. 33-40
• Révész, Gábor: A simple proof of Vinogradov's theorem on the orderability of the free product of $o$-groups. (English). Czechoslovak Mathematical Journal, vol. 37 (1987), issue 2, pp. 310-312