convex sequence

convex sequence

[′kän‚veks ′sē·kwəns]
(mathematics)
A sequence of numbers, a1, a2, …, such that ai + 1≤ (1/2)(ai + ai +2) for all i ≥ 1 (or for all i satisfying 1 ≤ i <>n- 2 if the sequence is a finite sequence with n terms).