动机
发表于 2025-3-23 13:12:39
B. F. McGuinness,Friedrich Waismann†A subgroup . of a group . is called pure if . = . ∩ . for all . ∈ .. A subgroup . of a, group . is called . (. ∈ .) if ... = . ∩ ... for all . ∈ .. Clearly a .-pure .-subgroup of a group is pure.
裂隙
发表于 2025-3-23 17:14:33
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Benign
发表于 2025-3-23 19:20:46
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Adherent
发表于 2025-3-24 02:13:29
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Indecisive
发表于 2025-3-24 06:02:16
P. V. S. Rao,Sunil Kumar KopparapuA mixed group . (. is a . ) if there exists a direct decomposition . with . a torsion-free group. . is called a . if it has a bounded index subgroup which splits. We mention the following results:
改变
发表于 2025-3-24 09:00:58
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Addictive
发表于 2025-3-24 11:01:41
Basic notionsThroughout this book by a group . we an mean . (i.e., commutative) group using for the binary operation the additive notation. The . is the cardinal number |.| of the set of its elements. If |.| is a finite (countable) cardinal number then . is called a ..
摇曳
发表于 2025-3-24 18:50:03
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优雅
发表于 2025-3-24 19:12:43
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NEG
发表于 2025-3-25 01:07:52
Homological methodsA . consists, by definition, of the following data: