Let X be a Banach space (real
or complex) and An and B be linear operators in X with D(B) ⊆ D(An),n = 1,2,⋯ .
The following note is concerned with existence and uniqueness of solutions of the
problem
| (1.1) |
and the limiting behavior of these solutions as the operators An tend to zero in a
sense to be specified. We will show that for a large class of operators the
problem (1.1) is well posed and that its solutions tend to the solution of the
problem
| (1.2) |
|