Митропольський, Ю.А.; Хома, Г.П.
(Український математичний журнал, 1993)
It is established that the linear problem utt−a²uxx=g(x,t), u(0,t)=u(π,t), u(x,t+T)=u(x,t) is always solvable in the space of functions A={g:g(x,t)=g(x,t+T)=g(π−x,t)=−g(−x,t)} provided that aTq=(2p−1)π, (2p−1,q)=1, where ...