Electron. J. Diff. Equ., Vol. 2015 (2015), No. 153, pp. 1-13.

Inverse coefficient problem for the semi-linear fractional telegraph equation

Halyna Lopushanska, Vitalia Rapita

Abstract:
We establish the unique solvability for an inverse problem for semi-linear fractional telegraph equation
$$
 D^\alpha_t u+r(t)D^\beta_t u-\Delta u=F_0(x,t,u,D^\beta_t u), \quad
 (x,t) \in \Omega_0\times (0,T]
 $$
with regularized fractional derivatives $D^\alpha_t u, D^\beta_t u$ of orders $\alpha\in (1,2)$, $\beta\in (0,1)$ with respect to time on bounded cylindrical domain. This problem consists in the determination of a pair of functions: a classical solution $u$ of the first boundary-value problem for such equation, and an unknown continuous coefficient $r(t)$ under the over-determination condition
$$
 \int_{\Omega_0}u(x,t)\varphi(x)dx=F(t), \quad    t\in [0,T]
 $$
with given functions $\varphi$ and $F$.

Submitted April 22, 2015. Published June 11, 2015.
Math Subject Classifications: 35S15.
Key Words: Fractional derivative; inverse boundary value problem; over-determination integral condition; Green's function; integral equation.

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Halyna Lopushanska
Department of Differential Equations
Ivan Franko National University of Lviv
Lviv, Ukraine
email: lhp@ukr.net
  Vitalia Rapita
Department of Differential Equations
Ivan Franko National University of Lviv
Lviv, Ukraine
email: vrapita@gmail.com

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