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>> No.15001367 [View]
File: 752 KB, 1137x1475, __remilia_scarlet_touhou_drawn_by_s_vileblood__9e1635282c2bfc59cbf1112a7042940f.jpg [View same] [iqdb] [saucenao] [google]
15001367

>>15001284
>Isn't the neighborhood of infinity, U(∞), defined to be the set of x whose absolute value is larger than _any_ N?
That's the empty set, by Archimedes.

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