On rectifiable spaces and paratopological groups
On rectifiable spaces and paratopological groups
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关于可校正空间和副拓扑群
DOI:
10.1016/j.topol.2010.12.008
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发表时间:
2011-03
影响因子:
0.6
通讯作者:
Rongxin Shen
中科院分区:
文献类型:
--
作者:
Fucai Lin (林福财);Rongxin Shen
We mainly discuss the cardinal invariants and generalized metric properties on paratopological groups or rectifiable spaces, and show that: (1) If A and B are ω-narrow subsets of a paratopological group G, then AB is ω-narrow in G, which gives an affirmative answer for A.V. Arhangel'shiı̌ and M. Tkachenko (2008) [7, Open problem 5.1.9]; (2) Every bisequential or weakly first-countable rectifiable space is metrizable; (3) The properties of Fréchet–Urysohn and strongly Fréchet–Urysohn coincide in rectifiable spaces; (4) Every rectifiable space G contains a (closed) copy of Sωif and only if G has a (closed) copy of S2; (5) If a rectifiable space G has a σ-point-discrete k-network, then G contains no closed copy of [Formula: see text] ; (6) If a rectifiable space G is pointwise canonically weakly pseudocompact, then G is a Moscow space. Also, we consider the remainders of paratopological groups or rectifiable spaces, and answer two questions posed by C. Liu (2009) in [20] and C. Liu, S. Lin (2010) in [21], respectively.
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DOI:
10.1090/s0002-9939-1971-0276919-3
发表时间:
1971
期刊:
--
影响因子:
--
作者:
P. O'Meara
通讯作者:
P. O'Meara
DOI:
10.1016/c2009-0-12309-7
发表时间:
1988-03
期刊:
--
影响因子:
--
作者:
K. Kunen;J. E. Vaughan
通讯作者:
K. Kunen;J. E. Vaughan
影响因子:
0.6
作者:
Takesi Isiwata
通讯作者:
Takesi Isiwata
影响因子:
0.6
作者:
Shou Lin;Yoshio Tanaka
通讯作者:
Shou Lin;Yoshio Tanaka
DOI:
--
发表时间:
1989
期刊:
--
影响因子:
--
作者:
V. Uspenskij
通讯作者:
V. Uspenskij