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x = ∑ n = 0 ∞ 1 n ! = lim n → ∞ 1 0 ! + 1 1 ! + 1 2 ! + ⋯ + 1 n ! {\displaystyle x=\sum _{n=0}^{\infty }{\frac {1}{n!}}=\lim _{n\to \infty }{{\frac {1}{0!}}+{\frac {1}{1!}}+{\frac {1}{2!}}+\cdots +{\frac {1}{n!}}}}
a ∉ B a ≠ B {\displaystyle a\not \in Ba\not =B}
