Shangquan Bu

S.Bu and G.Cai, “Periodic Solutions of Third-Order Mixed Degenerate Differential Equations With Two Infinite Delays in Vector-Valued Function Spaces.” Mathematische Nachrichten (2026): e70154. https://doi.org/10.1002/mana.70154 Conflicts of Interest The author are ranked in alphabetic order of their names and should be treated equally. Data Availability Statement The author has nothing to report.

We study the well-posedness of the degenerate fractional differential equations with finite delay: D α ( M u ) ( t ) + c D β ( M u ) ( t ) $D^\alpha (Mu)(t) + cD^\beta (Mu)(t)$ = A u ( t ) + F u t + f ( t ) , ( 0 ≤ t ≤ 2 π ) $= Au(t) + Fu_t + f(t),(0\le t\le 2\pi )$ on Lebesgue–Bochner spaces L p ( T ; X ) $L^p(\mathbb {T}; X)$ and periodic Besov spaces B p , q s ( T ; X ) $B_{p,q}^s(\mathbb {T}; X)$ , where A and M are closed linear operators in a complex Banach space X satisfying D ( A ) ⊂...