Compact Lie Groups
《Compact Lie Groups》 · 第 485 页 · Section 6.1「Finite Abelian Groups」末段
One calls a direct sum of infinite cyclic groups a free abelian group.
Compact Lie Groups
《Compact Lie Groups》 · 第 485 页 · Section 6.1「Finite Abelian Groups」末段
One calls a direct sum of infinite cyclic groups a free abelian group.
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