Approximate solution of the Fredholm integral equation of the first kind in a reproducing kernel Hilbert space Original Research Article

An approach for solving Fredholm integral equations of the first kind is proposed for in a reproducing kernel Hilbert space (RKHS). The interest in this problem is strongly motivated by applications to actual prospecting. In many applications one is puzzled by an ill-posed problem in space C[a,b]C[a,b] or L2[a,b]L2[a,b], namely, measurements of the experimental data can result in unbounded errors of solutions of the equation. In this work, the representation of solutions for Fredholm integral equations of the first kind is obtained if there are solutions and the stability of solutions is discussed in RKHS. At the same time, a conclusion is obtained that approximate solutions are also stable with respect to ‖⋅‖∞‖⋅‖∞ or ‖⋅‖L2‖⋅‖L2 in RKHS. A numerical experiment shows that the method given in the work is valid.