► A. Dehghan Nezhad, " Tangency of fuzzy topological ", The 10th Seminar on Math. Analysis and Application, Department of Mathematics, Vali-e-Asr University, Rafsenjan,February 9&10 (2000).

  ► A. Dehghan Nezhad, " The Seventeen type of two-dimensional periodic patterns in Islamic-Persian Art ",International conference of

mathematics for All, Kordestan University, Kordestan, Iran, 10 & 11 July (2000) (Persian).

  ► B. Davvaz, A. Dehghan Nezhad, " Chemical examples in hypergroups", 31 th Iranian Mathematics Conference, University of Tehran, Iran, 27-30 August (2000).

  ► A. Dehghan Nezhad, " A relationship between classical tessellation and three manifolds", First Seminar on Geometry and Topology, 14 & 15 January 2001, Tabriz, Iran.

  ► A. Dehghan Nezhad, "Research in mathematical methods of the existing geometrical designs and applications in Islamic-Iranian art tiling", Second Congress of History of Iranian Architecture and Urbanism, Bam citadel, Kerman, Iran, April 14-18 (1999), (Persian).

► A. Dehghan Nezhad, "Fuzzy Sg-compact set in fuzzy topological spaces",The 11th Seminar on Math. Analysis and Application, Iran, Yazd University, Yazd, February 3 & 4, 5 (2001).

► A. Dehghan Nezhad, " The concept to three-manifolds in graph theory ", The International Conference in Graph Theory, The University of Auckland, New Zealand, 10- 16 Dec (2000).

  ► Participation in l'Ecole C.I.M.P.A. de Marrakech, (Maroc), " Géométrie et Topologie Différentielle; Géométrie Algorithmique ", 17-29 Mai (2004).

  ► A. Dehghan Nezhad, "Hypergroupe et applications ", Conference in Lamav, The University of Valenciennes, France, 21 June (2006).

  ► Akbar Dehghan Nezhad, " An introduction on cohomological equation and Cohomology-free ", 38th Annual Iranian Mathematics conference, 3-6 September 2007, University of Zanjan, Iran, 308-310.

► Akbar Dehghan Nezhad, " On the cohomological equations for some solvmanifolds", Extended Abstracts of 39th Annual Iranian Mathematics Conference 24-27 August 2008, Shahid Bahonar University of Kerman, Kerman, I.R.Iran.

► Akbar Dehghan Nezhad, "The leafwise Dolbeault cohomology on some solvmanifolds ", Eight seminar of differential equations dynamical systems and their applications , Isfahan University of technology, Isfahan, Iran, July 19-21, 2008, (124-127).

► A. Dehghan Nezhad, " The 17 wallpaper groups ", 10th Iranian Mathematics Education Conference, Yazd, Iran, Aug. 2008.

► Akbar Dehghan Nezhad and Arefeh Torki Bioki, "A Generalization of the Zig-Zag Lemma",22th Iranian Algebra Seminar, 31-2Jan-Feb 2012, University of Sabzevar, Iran.

► Akbar Dehghan Nezhad, "Some Recent Results and Questions Concerning The Cohomological equations",The Seventh seminar on Geometry and Topology 29-30 January 2014, Iran University of Science and Technology, Tehran, I.R.Iran.