左R加群も結局、ℤ加群として見れば可換環上の加群と同じ議論ができそうに見えるのだが……(exactnessなど)
有り体に言うと左乗法の存在感が薄いような気がしている
左R加群も結局、ℤ加群として見れば可換環上の加群と同じ議論ができそうに見えるのだが……(exactnessなど)
有り体に言うと左乗法の存在感が薄いような気がしている
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