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補課，前幾天還在妄想直接從測度論的章節開始，顯然是想多了，又退回點集拓撲，最後還是回到微積分一😬
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補課，前幾天還在妄想直接從測度論的章節開始，顯然是想多了，又退回點集拓撲，最後還是回到微積分一😬
Like my work?
Don't forget to support or like, so I know you are with me..
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