We deal with boundary value problems for
equations with the operator
, where is a nonnegative elliptic differential
operator and with boundary operators depending on a positive real
parameter . In particular, boundary conditions can be given
through the one-sided Marchaud, Grünwald-Letnikov or
Liouville-Weyl fractional derivatives of order . We find
orthogonality and smoothness conditions on the boundary function,
which guarantee both the existence and uniqueness of the classical
solutions. Examples of the operator are discussed.
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