“…Thereafter, El‐Hamidi extended the (A‐R) condition for nonlinearity f ( t , x , y ), ie, there exist constants μ 1 > p , μ 2 > p and M 2 > 0 such that for any , , and can be as the consequence of , where are two positive constants. In general, the (A‐R) condition plays a necessary part to ensure the boundedness of Palais‐Smale sequences associated with the Euler‐Lagrange functional, and it arises in many relevant literatures frequently . For example, under assuming the (A‐R) condition, the authors concerned the existence of at least one solution for a fractional differential equation by using critical point theorems in Jiao and Zhou …”