科隆尊
科隆斯塔
......この程度で、世に安寧をもたらしたるつもりか?
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太爽了⌯>ᴗo⌯ .ᐟ.ᐟ
冬天跑步，爽😯
Halmos Don't just read it; fight it! Ask your own questions, look for your own examples, discover your own proofs. Is the hypothesis necessary? Is the converse true? What happens in the classical special case? What about the degenerate cases? Where does the proof use the hypothesis?
好久不看拓扑了，好多小结论都记不清了😡
获赞数和数值相同了☺️ 333
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