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$$\det(AB) = \sum_{S\in\tbinom{[n]}m} \det(A_{[m],S})\det(B_{S,[m]})$$

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3115201

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$$e^x = \sum_{n=0} \frac{x^n}{n!}$$

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π⁴+π⁵≈e⁶ | Per Aspera Ad Astra

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-O2

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举办一个魂喵,举办一个魂谢谢喵

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空を見上げて、空を見つめて、空を楽しんで、答えはそこにある。

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还能要吗。

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Nothing is wasted

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#895: Naganohara_Yoimiya

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