Messaoudene Hadia
      Study of classes of operators where the distance of the identity operator and the derivation range is maximal or minimal
      International Journal of Mathematical Analysis, Vol. 8, 2014, no. 11, 503-511
      http://dx.doi.org/10.12988/ijma.2014.4245

Copyright © 2014 Messaoudene Hadia. This article is distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.