 Følner sequence for the integers

ID: folner-sequence-for-the-integers

The intervals

F_{n} = {- n, \dots, n}

Z

, because

\frac{∣ ( F _{n} + 1 ) △ F _{n} ∣}{∣ F _{n} ∣} = \frac{2}{2 n + 1} ⟶ 0.

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