... continuous, and ft T, x−ft, x for allt, x ∈ R×Rn. Under certain conditions on the nondiagonal elements of A and f we prove anexistence result for E1.1.InSection 3 we consider the ... evolution equations,” Nonlinear Analysis: Theory, Methods & Applications, vol. 26, no.9, pp. 1511–1525, 1996.27 P. Souplet, “Optimal uniqueness condition for the antiperiodic solutions of ... of Mathematical Analysis and Applications, vol. 204, no. 3, pp. 754–764, 1996.24 H. Okochi, On the existence of anti-periodic solutions to a nonlinear evolution equation associated with odd...