International Journal of Mathematics and Mathematical Sciences
Volume 8 (1985), Issue 2, Pages 403-406
doi:10.1155/S0161171285000424
Abstract
An equation of the form y−A(t)y=f(t) is considered, where Δy=y(t+δ)−y(t)δ, and the necessary and sufficient criteria for the exponential growth of the solution of this equation is obtained.