ty -jour a2 -el -sayed，ahmed au -hu，lei py -2016 da -2016/11/09 ti- resonance sp -9260726 vl -2016 ab -2016 ab -2016 ab -by -2016/11/09 ti-对周期性边界价值问题的积极解决方案 -Leggett-Williams norm-type theorem for coincidences due to O’Regan and Zima, we discuss the existence of positive solutions to fractional order with periodic boundary conditions at resonance. At last, an example is presented to demonstrate the main results. SN - 1687-9643 UR - https://doi.org/10.1155/2016/9260726 DO - 10.1155/2016/9260726 JF - International Journal of Differential Equations PB - Hindawi Publishing Corporation KW - ER -