X's 在英文书籍中,看到数学符号X's,在书中是有这么一段：(X's or ε's,where X= 2ε-1,and so Sn = X1 +...+Xn = 2(ε1 +...+ εn)-n)这里还有一句，This test makes use of that approximation to assess the closeness of the fraction

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