![statement[![][2]](https://i.stack.imgur.com/xL22l.png)
![statement and the proof[![][1]](https://i.stack.imgur.com/RBSXm.png)
can anybody explain how the proof of this corollary is concluded? i understood the proof right before the underlined sentence but still do not get how the argument before that leads to the underlined sentence. thank you. (uploaded 2 photos)
2026-02-23 05:13:26.1771823606
weaker upper bound of class number of O_k
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