EDB — 21X

Exercises

1. [21X]Let \(k∈ℕ\) and let \(I=\{ 0,\ldots ,k\} \) with the usual ordering of \(ℕ\): show that the concatenation of \(I\) with \(ℕ\) has the same type of order as \(ℕ\); while the concatenation of \(ℕ\) with \(I\) does not have the same type of order.