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  • Arithmetic pattern $1 + 2 = 3$, $4 + 5 + 6 = 7 + 8$, and so on
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  • Why is $1/i$ equal to $-i$? - Mathematics Stack Exchange
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  • Why is $1$ not a prime number? - Mathematics Stack Exchange
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  • Formal proof for $ (-1) \times (-1) = 1$ - Mathematics Stack Exchange
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  • What is the value of $1^i$? - Mathematics Stack Exchange
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  • abstract algebra - Prove that 1+1=2 - Mathematics Stack Exchange
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  • If $A A^{-1} = I$, does that automatically imply $A^{-1} A = I$?
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  • False Proof of 1=-1 - Mathematics Stack Exchange
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  • Word，插入多级列表，但是改了1.1，第二章的2.1也变成1.1，随着 …
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  • factorial - Why does 0! = 1? - Mathematics Stack Exchange
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