WELL-POSEDNESS FOR CAUCHY FRACTIONAL PROBLEMS INVOLVING DISCRETE
CONVOLUTION OPERATORS
Abstract
This work is focused on establishing sufficient conditions to guarantee
the well-posedness of the following nonlinear fractional semidiscrete
model \begin{equation*} \begin{cases}
\mathbb D^\beta_t u(n,t)= B u(n,t) +
f(n-ct,u(n,t)),\,
&n\in\mathbb{Z},
\;t>0,\\
u(n,0)=\varphi(n),\;
&n\in\mathbb{Z},\\
\end{cases} \end{equation*} under the
assumptions that $\beta \in (0,1]$,
$c>0$ some constant, $B$ is a discrete convolution
operator with kernel
$b\in\ell^1(\Z)$,
which is the infinitesimal generator of the Markovian $C_0$-semigroup
and suitable nonlinearity $f$. We present results concerning the
existence and uniqueness of solution, as well as establishing a
comparison principle of solutions according to respective initial
values.