ACTA MATHEMATICA HUNGARICA, cilt.135, ss.1-7, 2012 (SCI-Expanded)
We present some compactness properties of L-weakly and M-weakly compact operators on a Banach lattice under additional conditions. Thus, we can say that every bounded operator which commutes with any L-weakly or M-weakly compact operator have a non-trivial closed invariant subspace.