International Conferences and Meetings abroad

  • Delivered a contributed talk in the 26th British Combinatorial Conference, July 3-7, 2017, University of Strathclyde, Glasgow, Scotland, UK
  • Delivered a contributed talk in the 15th Cologne Twente Workshop on Graphs and Combinatorial Optimization, June 6-8, 2017, University of Cologne, Cologne, Germany
  • Delivered an invited talk (Graph theory and its applications) in Umm Al Qurra University, May 21, 2017,  Makkah, Saudia Arabia
  • Delivered an invited talk in the Lebanese International Conference on Mathematics and Applications, May 16-19, 2017, Lebanese University of Beirut, Beirut, Lebanon
  • Visitng Professor to Xian Jiotong-Liverpool International University, Suzhou, Delivered an extension lecture on "Ëuler's formula on planar graph and its applications", November 1-3, 2016, China; Delivered an invited talk (Signless Laplacian eigenvalues of a graph) in the International Conference on Graph Theory, Combinatorics and Applications, October 29-31, 2016, Zhejiang Normal University, Jinhua, China; Participated in Shanghai Mini-Workshop on Graph Theory, Coctober 28, 2016, Shanghai Centre for Mathematical Sciences. Fudan University, Shanghai, China
  • Delivered a plenary talk (Laplacian eigenvalues of a graph and Brouwer's conjecture) in the International Conference on Discrete Mathematics and Computer Science, November 15-19, 2015, Djillai Liabes University, Sidi Bel Abbes, Algeria 
  • Presented a contributed talk (Laplacian energy of graphs) in the 34th Colloquium on Combinatorics, November 6-7, 2015, Technishe Universitat Ilmenau, Ilmenau, Germany
  • Delivered an invited talk in the Lebanese International Conference on Mathematics and Applications, May 26-29, 2015, Lebanese University of Beirut, Beirut, Lebanon
  • Visiting Professor to Faculty of Mathematics and Natural Sciences, Insitut Teknologi Bandung, November  01-07, 2014, Indonesia, Delivered an invited talk in Bandung Workshop on Combinatorics and  Optimization BWCOP 2014
  • Presented a contributed talk  (Energy of graphs and Laplacian energy of graphs) in International Congress of      Mathematicians (ICM), August 13-21, 2014, Seoul, South Korea
  • Participated in the 26th International Conference on Formal Power Series and Algebraic Combinatorics, June 29-July 03, 2014, Chicago, USA
  • Delivered a Planery talk (Energy of signed graphs and signed digraphs) in International Workshop on Discrete Structures, March 05-07, 2014, NUST, Islamabad, Pakistan.
  • Presented a contributed talk (Strong double graphs-energy and Laplacian energy) in International Conference in Mathematical Technology of Networks-QGraphs ,  Dec.  04-07, 2013, ZIF, University of Bielefeld, Bielefeld,  Germany
  • Delivered an invited talk (Tournaments, oriented graphs and football sequences) I the 3rd Indo-Taiwanese  Conference in Discrete Mathematics, November, 19-22, 2013, Taipei, Taiwan
  • Delivered a contributed talk in the 12th Cologne Twente Workshop on Graphs and Combinatorial Optimization, May 21-23, 2013, University of Twente, Enschede, Netherlands
  • Participated, Presented a contributed talk  (Scores, Losing scores and degrees in hypertournaments) and Chaired a session  in the ICTP-IPM  Workshop and Conference in Combinatorics and Graph Theory, Sept 03-14, 2012, ICTP, Trieste,   Italy
  • Delivered an invited lecture on Some Applications of Graph Theory in Istanbul  Commerce University, Feb, 13-15, 2012,  Istanbul, Turkey
  • Presented a contributed talk (Imbalances in (a,b,p,q)-bipartite tournaments) in  International Conference on Mathematics and Computer Science,  (MACS2012),  Feb. 9-12, 2012,  Siofok, Hungary.
  • Presented a contributed talk (Mark sequences in bipartite multidigraphs) in International Congress of Industrial and  Applied Mathematics, (ICIAM2011),  July  18-22, 2011,Vancouver,  Canada
  • Presented a contributed talk (Clusterability of portfolio signed graphs) in International Conference on Games and  Decision in Risk and Reliability, May 19-21,  2011 Belgirate,  Milan, Italy
  • Presented a contributed talk (Optimum allocation in multivariate two stage sampling: A geometric  programming approach) in International Conference on  Operations and Statistics, April 7-8, 2011,  Penang,   Malaysia
  • Presented a contributed talk (Applications of Graph Theory in Mathematics) in Conference Mathematics and  Applications, March 23-24, 2011, Al-Imam Mohammad bin Saud Islamic University,  Riyadh,  Saudi  Arabia
  • Presented a contributed talk  (Imbalance sequences and sets in multipartite  multidigraphs) in French Combinatorial  Conference(FCC10), June  28-July 02,  2010,  University Paris Sud, France
  • Presented a contributed talk (On imbalances in bipartite multidigraphs) in  Algebraic  Combinatorics and  Applications, April 11-18, 2010  University  Bureuth, Germany
  • Visiting Professor, July 19-22, 2009, Queenmary College, University of  London,  London, England
  • Presented a contributed talk (On r-imbalances in tripartite r-digraphs) in the 7th  International Society of  Analysis  and  Applications Congress (ISAAC), July  13-18,  2009,   Imperial College,  London,  England
  • Presented a contributed talk (On scores in multipartite hypertournaments) in the  22nd  British Combinatorial Conference   (BCC),  July 5-11, 2009,   St. Andrews   University,   Scotland
  • Presented a contributed talk (Graph Theory and Applications)  in the  International  Congress of Industrial and Applied Mathematics (ICIAM07), July 16-20, 2007 ETH   Zurich,  Switzerland 
  • Visiting  Professor to Nanjing University, China, April 2-11, 2007,  Nanjing, China


Conferences and meetings in India

  • Delivered an invited talk in the National level Workshop on Graph Theory: Algebraic and Algorithmic Aspects, December 19-24, 2016, Aliah University, Kolkata (Graphs and matrices)
  • Delivered an invited talk in the International Conference on Current Trends in Graph Theory and Computations, September 17-19, 2016, South Asian University, New Delhi ( Sum of signless Laplacian eigenvalues of a graph)
  • Delivered an invited talk in The International Conference on Graph Theory and Applications, December 16-19, 2015, Amrita Vishwa Vidyapeetham, Coimbatore, Tamil Nadu (Sum of Laplacian eigenvalues of a graph and Brouwer's conjecture)
  • Delivered an invited talk in the International Conference on Mathematical Biology, Analysis and Applications, June 4-6, 2015, Department of Applied Mathematics, AMU, Aligarh, India
  • Delivered an invited talk in the Research Promotion Workshop on Introduction to Graphs and Geometric Algorithms, May 18-20, 2015, University of Kashmir (jointly with Tata Institute of Fundamental Research, Mumbai)
  • Delivered an invited talk in the Workshop on Mathematical Biology, April 2-4, 2015, University of Kashmir, India
  • Delivered an invited talk in The International Conference on Algebra, Geometry, Analysis and their applications (ICAGAA-14) , Nov 27-29, 2014, JMI, New Delhi
  • Delivered an Invited talk in International Conference on Applied Mathematics and Theoretical Computer Science, Jan 24-25, 2013, St. Xavier’s Catholic  College of  Engineering, Nagercoil, Tamil Nadu, India (Combinatorics of digraph sequences)
  •  Participated in the International Conference On recent trends in Discrete Mathematics, December 17-20, 2012, Tata Institute of  Fundamental Research, Mumbai
  • Delivered an invited talk in National Seminar on The role of Mathematics in developing the creative thinking,  October 6, 2012, SP College, Srinagar, India   (Applications of Combinatorics and Graph Theory)
  • Delivered an invited talk in National Seminar on Applications of Mathematics  to  Science and Technology,  Sept 29, 2012, Baba Ghulam Shah Badshah University,  Rajouri, India  (Applications of Graph Theory in Science and Technology)
  • Presented a contributed talk in JK Science Congress, Sept. 17-19, 2012,  University of Kashmir, Srinagar, India  (Football Sequences and oriented graphs)
  • Delivered an invited talk in National Workshop on Role of mathematics in Science, Engineering and Technology, March 26, 2012, National Institute of  Technology,  Srinagar, India  (Pythagrean Theorem: A for thousand years history)
  • Delivered an invited talk in National Conference Theoretical Computer  Science  and  Discrete Mathematics    (NCTCSDM), Jan 9-11, 2012, jointly  organized by n-CARDMATH  Kalasalingam University, Krishankoil,  India and Ball State  University,  USA    (Scores, losing scores and total scores in hypertournaments)
  • Visiting Professor to n-CARDMATH  Kalasalingam University, Krishankoil,  India,  Jan 4-12, 2012
  • Invited speaker in International workshop on set-valuations, signed graphs and  geometry(IWSSG), Sep 02-07, 2011, Mananthavady, Kerala   (Signed degree sequences in signed graphs)
  • Presented a contributed talk in JK Science Congress, July 25-26, 2006,  University of  Kashmir, Srinagar,  India  (Some problems on scores in oriented graphs)
  • Presented a contributed talk in National Conference on Graph Theory and Applications, March 14-16, 2001,  Anna University, Chennai  (Construction of oriented graphs)