Stability of linear differential equations of third order

The aim of this paper is to investigate the Hyers–Ulam stability of the linear differential equation y(3)(t)+αy″(t)+βy′(t)+γy(t)=f(t)y(3)(t)+αy″(t)+βy′(t)+γy(t)=f(t), where y∈C3[a,b]y∈C3[a,b], f∈C[a,b]f∈C[a,b] and −∞