N

La suite $a_n=\frac1n$ tend vers zéro lorsque $n\to\infty$.

ε = 1 (slider from 0 to 1, step 0.001)
h(x) = If[0 ≤ x ≤ 1000, ε]
g(x) = If[0 ≤ x ≤ 1000, (-ε)]
n = Point(xAxis)
P: (x(n), (-ε))
Q: (x(n), ε)
f = Segment(Q, P)
N = 1000
poly1, i, j, k, l = Polygon(P, Q, (N, ε), (N, (-ε)))
s = Sequence((n, 1 / n), n, 1, N)