Ascending Hnn Extensions of Finitely Generated Free Groups Are Hopfian
Ascending Hnn Extensions of Finitely Generated Free Groups Are Hopfian
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有限生成自由群的升 Hnn 扩展是 Hopfian
DOI:
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发表时间:
2001
期刊:
影响因子:
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通讯作者:
D. Wise
中科院分区:
文献类型:
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作者:
R. Geoghegan;M. Mihalik;M. Sapir;D. Wise
It is shown that every ascending HNN extension of a finitely generated free group is Hopfian. An important ingredient in the proof is that under certain hypotheses on the group H, if G is an ascending HNN extension of H, then cd(G) = cd(H) + 1.