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Example

• S := {<0, 2>, <1, 3>, <2, 4>, <3, 4>, <4, 5>}:

  S = [2, 3, 4, 4, 5].

  We have length(S) = 5 and

  S₀ = 2, S₁ = 3, S₂ = 4, S₃ = 4, S₄ = 5.

  Furthermore (forall i in N₅: 0 < S_i < 10).
• T := {<i, i²>: i in N}:

  T = [0, 1, 4, 9, 16, 25, ...].

  We have (forall i in N: S_i = i²).