Talks

  1. Raffoul, Y., New Variation of Parameters Formula that Leads to Stability and Periodicity in Functional Differential, Joint AMS Meeting, Baltimore, January 16-19, 2019. (Invited)

  2. Raffoul, Y., Introduction to time scales with applications to dynamical systems, The Ninth Annual Meeting of the "Lebanese Society for the Mathematical Sciences", LSMS-2019, Lebanese University, Fanar Beirut Lebanon, June 15, 2019. Main Speaker.

  3. Raffoul Y., Qualitative analysis of solutions of nonlinear and neutral difference equations, ICDEA2019, University College London, June 24, 2019. (Invited)

  4. Raffoul Y. N. “Qualitative analysis of non-convolution Volterra summation, Fall Southeastern Sectional Meeting (SEARCDE2018), University of North Georgia, Gainsville, GA, October, 6-7, 2018. (invited)

  5. Raffoul, Y., Nonstandarized Discretization Scheme In Volterra Integro-differential that preserve asymptotic stability, Joint AMS Meeting, San Diego, January 16-13, 2018. (Invited)

  6. Raffoul, Y., Stability Boundedness and Periodicity in Volterra Summation Equations, LAAS 24 Conference, Univerity of Balamand, April 24-26. 2018. (invited)

  7. Raffoul Y. N. “Discretization scheme in Volterra integro-differential equations that preserves stability and boundedness Fall Southeastern Sectional Meeting (SEARCDE2017), Kennesaw State University, Kennesaw, GA, October, 7-8, 2017. (invited)

  8. Raffoul Y. N. “The Case for Large Contraction with Application to Delay Differential Equations,” Notre Dame University, Lebanon, August 10, 2017. (Invited)

  9. Raffoul Y. N. “Existence of Bounded Solutions for Almost Linear Volterra Difference Equations Using Fixed Point Theory and Lyapunov Functionals,” May 9, 2017, Okayama University, Okayama Japan. (Invited, All expenses were paid by Okayama University.

  10. Raffoul Y. N. “Exponential Stability and Instability in Finite Delay Volterra Difference,” May2017, Okayama University, Okayama Japan. (Invited, all expenses were paid by Okayama University)

  11. Raffoul Y. N. “Stability and Boundedness in Nonlinear Infinite Delay Volterra Discrete Systems Using Lyapunov Functionals,” April 22-23, 2017, Washington State University, Pullman WA, Spring Western Sectional Meeting (AMS) (Invited)

  12. Raffoul Y. N. “Large Contraction and Its Applications to Totally Nonlinear Delay Differential Equations,” November 12-13, 2016, North Carolina State University, Raleigh, Fall Southeastern Sectional Meeting (AMS) (Invited)

  13. Raffoul Y. N. “Introduction to Time Scales with Applications,” Notre Dame University, Lebanon, August 10, 2016. (Invited)

  14. Raffoul Y. N. “Boundedness of Solutions in Almost Linear Volterra Difference Equations Using Fixed Point Theory and Lyapuno Functionals,” ICDEA2016, Osaka Japan, July 24-29, 2016. (Invited)

  15. Raffoul Y. N. “ Stability in Nonlinear Finite Delay Volterra Integro-differential Systems Fall Southeastern Sectional Meeting (SEARCDE2016), Florida Gulf Coast University, Fort Myers, FL, November 4-6, 2016. (invited)

  16. Raffoul Y. N. “Existence and Uniqueness of Asymptotically Constant Or Periodic Solutions In Delayed Population Models,” School of Mathematical Sciences, Colloquium, Rochester Institute of Technology, October, 14, 2016.

  17. Raffoul Y. N. “Exponential Stability and Instability in Multiple Delays Difference Equations,” Joint Mathematics Meeting, Meeting Number 1116, Seattle January 6-9, 2015 (Invited)

  18. Raffoul Y. N. “ Lyapunov Functionals and Stability in Nonlinear Finite Delay Volterra Discrete Systems,” SEARCDE-2015; The University of North Carolina at Greensboro, Oct.10-11, 2015. (Invited)

  19. Raffoul,Y., Existence Of Bounded Solutions For Almost Linear Volterra Difference Equations Using Fixed Point Theory and Lyapunov Functionals.

  20. Raffoul Y. N. “ Lyapunov Functionals and Stability in Nonlinear Finite Delay Volterra Discrete Systems,” SEARCDE-2015; The University of North Carolina at Greensboro, Oct.10-11, 2015. (Invited)

  21. Raffoul, Y., Lyapunov functional and stability in nonlinear finite delay Volterra discrete systems Comparison between fixed point theory and Lyapunov functionals,” Notre Dame University, Lebanon, August 11, 2015.

  22. Raffoul, Y., Existence of bounded solutions for almost linear Volterra difference equations using fixed point theory and Lyapunov functionals,” March 07-08, 2015, Georgetown University, Washington DC.Spring Eastern Sectional Meeting.

  23. Raffoul Y. N. “Qualitative Analysis of Solutions of Nonlinear Delay Dynamic Equations," EARCDE-2014; Univ. of Memphis, Tennessee, Oct.11-12, 2014. (Invited)

  24. Raffoul,Y., “Comparison between fixed point theory and Lyapunov functionals,” Notre Dame University, March 03, 2014.

  25. Raffoul, Y., “Qualitative Analysis of Functional Differential equations Using Fixed Point Theory,” American University of Beirut, March 05, 2014.

  26. Raffoul, Y., “Fixed Point Or Lyapunov Functional ?,” Canakkale Onsekiz Mart University, Canakkale, Turkey. March 02, 2014.

  27. Raffoul, Y., “Exponential Stability And Instability In Finite Delay Nonlinear Volterra Integro-Ddifferential And Difference Equations,” Balamand University, March 20, 2014.

  28. Raffoul, Y., “Qualitative Analysis of Functional Stochastic Differential Equations,” Notre Dame University, March 21, 2014.

  29. Raffoul, Y., “Boundedness And Exponential Stability In Highly Nonlinear Stochastic Differential Equations,” April 4-6, 2014 University of New Mexico, Albuquerque, AMS,Western Spring Sectional Meeting.

  30. Raffoul Y. N. “Functional Differential Equations on Periodic Time Scales with Applications to Population Models, A Conference in Honor of The Many Accomplishments of Dr. Allen Peterson, University of Nebrasks-Lincoln, October 25-28, 2013 (Invited)

  31. Raffoul Y. N. “Boundedness in Functional Difference Equations, “ New Trends in Differential and Difference Equations, A Conference in Honor of Dr. John R. Graef’s 70th Bihtday, The University of Tennessee at Chattanooga, March 15-16, 2013 (Invited)

  32. Raffoul Y. N. “Delay Equations with Application to Bernoulli Type Differential equations,”SEARCDE-2013; Univ. of Tennessee Knoxville, Sept. 21-22, 2013. (Invited)

  33. Raffoul Y. N. “Stability in Highly Nonlinear Difference Equations, “ Joint Mathematics Meeting, San Diego, January 9-12, 2013 (Invited)

  34. Raffoul Y. N., International Conference on The Theory, Methods and Applications of 
Nonlinear Equations, December 17-20, 2012 Texas A&M, Kingsville, on “Recent Results in Functional Differential Equations.” (Invited)

  35. Raffoul Y. N., 2012, Fall Eastern Sectional Meeting, September 22-23, 2012 Rochester Institute of Technology, Rochester, NY, on “Necessary and Sufficient Conditions For Uniform Boundedness In Functional Difference Equations. (Invited)

  36. Raffoul Y. N., 2012, The 8th International Conference on Differential Equations and Dynamical Systems, “Exponential Sytability and Instability in Finite Delay Nonlinear Volterra Integro-differential Equations, “ Unversity of Waterloo, August 1-4, 2012. (Invited)

  37. Raffoul Y. N., 2012 Spring Eastern Sectional Meeting, American Mathematical Society, George Washington University, Washington DC, “On the permanence of discrete-time multi-species competition predation system with several delays”, invited, March 17, 2012. (Invited)

  38. Raffoul Y. N. “Periodicity In General Delay Nonlinear Difference Equations Using Fixed Point Theory”, Joint Mathematics Meeting, Boston, January 4, 2012 (Invited)

  39. Raffoul Y. N., Fall Central Section Meeting, American Mathematical Society, University of Nebraska-Lincoln, Lincoln, NE, “Necessary and sufficient conditions for uniform stability in volterra systems of integro-dynamic equations on time scale”, Invited, October 16, 2011.

  40. Raffoul Y. N., The 31st Southeastern-Atlantic Regional Conference on Differential equations, Georgia Southern University, “Classification Of Positive solutions Of Nonlinear Systems Of Volterra Integro-Dynamic Equations On Time Scales”, October 01, 2011.

  41. Raffoul, Y. N., Paper, 2011 Spring Southeastern meeting, American Mathematical Society, Georgia Southern University, "Positive periodic solutions in neutral dynamic equations on time scale. Invited. (March 12, 2011).

  42. Raffoul, Y. N., Paper, 1062nd AMS Meeting, American Mathematical Society, Syracuse University, "Inequalities That Lead To Exponential And Instability In Delay Difference Equations, Invited. (October 3, 2010).

  43. Raffoul, Y. N., Invited Lecture or Address, The Fourth International Conference on Neural, Parallel and Scientific Computations, Morehouse College, Atlanta, Georgia, "nequalities and Exponential Stability and Instability In Finite Delay Volterra Integro-differential Equations", Invited. (August 12, 2010).

  44. Raffoul, Y. N., Spring Sectional meeting, American Mathematical Society, Macalester College, "Exponential Stability And Instability In Finite Delay Nonlinear Volterra tegro-differential Equations. Invited. (April 11, 2010).

  45. Raffoul, Y. N “Population Models Withy Asymptotically Constant or Periodic Solutions”, Joint Mathematics Meeting, Washington DC, January 5-8, 2009. (Invited)

  46. Raffoul, Y. N “Exponential Analysis of Solutions of Differential Equations with Unbounded Terms “, 1044th AMS Meeting, Special Session on Dynamic and Applications of Differential equations, IV, University of Alabama in Huntsville, October 23-25, 2008. (Invited)

  47. Raffoul, Y. N “Basic and Recent Results in Differential Equations,” WCNA, Orlando FL, July 03, 08. (Invited)

  48. Raffoul, Y. N “Existence of Periodic and Positive Periodic Solutions in Totally Nonlinear Delay Differential Equations,” WCNA, Orlando FL, July 03, 08.(Invited)

  49. Raffoul, Y. N “Fixed Point Theory OR Lyapunov Functionals?” Izmir University of Economics, August 07, 2008, Izmir, Turkey.(Invited)

  50. Raffoul, Y. N “Boundedness And Exponential Stability In Highly Nonlinear Stochastic Differential Equations,” Symposium on Dynamical Systems, Izmir University of Economics, August 09, 2008, Izmir, Turkey. (Invited)

  51. Raffoul, Y. N “Exponential Analysis of Solutions of Functional Differential Equations with Unbounded Terms,” SEARCDE-28; Univ. of Arkansas at Little Rock, October 11, 2008. (Invited)

  52. Raffoul, Y. N "Comparison between fixed point theory and Lyapunov functionals," University of Central Arkansas, Mathematics Colloquium , February 13, 2007. (Invited)

  53. Raffoul, Y. N "Stability in neutral nonlinear differential equations using fixed point theory," University of Arkansas at Little Rock, Mathematics Colloquium , February 8, 2007. (Invited)

  54. “Boundedness in functional dynamic equations on time scale," at the Joint Mathematics Meeting, New Orleans, January 8, 2007. (Invited)

  55. Raffoul, Y. N "Stability In Neutral Nonlinear Dynamic Equations on a Time Scale With Functional Delay," AMS Sectional Meetings, Miami University, Oxford, OH, March 16-17, 2007. (Invited)

  56. Raffoul, Y. N "Periodicity in Nonlinear Systems With Infinite Delay," Conference In Honor Of Professor Allan Peterson, Monastery Of Novacella, Italy, July 28-August 2, 2007. (Invited)

  57. Raffoul, Y. N "Neutral Nonlinear Dynamic Equations on Time Scales," Department Colloquium In Applied Mathematics Series, University of New South Wales, Australia, March 07, 2007. (Invited)

  58. Raffoul, Y. N "Krasnoselskii's Fixed Point Theorem and the Existence of Positive Periodic Solutions In Neutral Differential Equations," SEARCDE 07, Murray State University, October 19-20, 2007. (Invited)

  59. Raffoul, Y. N "Basic and Recent Results in Differential equations," Department Colloquium In Mathematics Series, University of Missouri-Rolla, October 12, 2007. (Invited)

  60. Raffoul, Y. N “Classification of positive solutions of nonlinear systems of Volterra integral equations,” The 26rd Annual Southeastern-Atlantic Regional Conference on Differential Equations at University of North Carolina, Greensboro, NC, October 27-88, 2006. (Invited)

  61. Raffoul, Y. N “Discretization scheme in Volterra integro-differential equations that preserves stability and boundedness,” at the Joint Mathematics Meeting, San-Antonio, January 11-15, 2006. (Invited)

  62. Raffoul, Y. N “Stability in neutral nonlinear dynamic equations on a time scale with functional delay,” at the 2005 Spring Southeastern Sectional Meeting of the American Mathematical Society, Bowling Green, KY, March 18-19, 2005. (Invited)

  63. Raffoul, Y. N “Positive solutions for a nonlinear functional dynamical equation on a time scale,” at the 1011th AMS Meeting, University of Nebraska, Lincoln, Nebraska, October 21-23, 2005. (Invited)

  64. Raffoul, Y. N “Boundedness in nonlinear functional differential equations with applications to totally nonlinear Volterra integro-differential equations,” Louisiana State University, Lafayette, Mathematics Colloquium , March 11, 2005. .(Invited)

  65. Raffoul, Y. N “Exponential stability of dynamic equations on time scales,” at the Joint Mathematics Meeting, Atlanta, January 5-8, 2005. (Invited)

  66. Raffoul, Y. N “Boundedness in functional dynamic equations on time scales,” Conference on Differential and Difference Equations and Applications,” Florida Institute of Technology, Melbourne, FL, August 1-5, 2005. (Invited)

  67. Raffoul, Y. N “Positive periodic solutions of functional discrete systems and population models,” at the 9th International Conference on Difference Equations and Applications, August 2-6, 2004, University of Southern California, Los Angeles. (Invited)

  68. Raffoul, Y. N “Periodicity in general delay nonlinear difference equations using fixed point theory,” at the Fourth World Congress of Nonlinear Analysts, June 30-July 7, 2004, Orlando, Florida. (Invited)

  69. Raffoul, Y. N Presented “Lyapunov functionals or fixed point theory?,” Ohio University, Mathematics Colloquium, May 20, 2004, (Invited).

  70. Raffoul, Y. N, Presented “Stability in neutral nonlinear differential equations with functional delays using fixed point theory,” Wright State University, Department of Mathematics Colloquium, January 2003. (Invited)

  71. Raffoul, Y. N “Exponential stability in nonlinear functional differential equations with applications to Volterra integro-differential equations,” The Fourth World Congress of Nonlinear Analysts, June 30-July 7, 2004, Orlando, Florida. (Invited)

  72. Raffoul, Y. N “Boundedness in nonlinear functional differential equations,” The 995th AMS Meeting, Ohio University, Athens, Ohio, March 26-27, 2004. (Invited).

  73. Raffoul, Y. N “Stability in neutral nonlinear differential equations with functional delay using fixed point theory,” The 23rd Annual Southeastern-Atlantic Regional Conference on Differential Equations at Kennesaw State University, October 17-18, 2003. (Invited)

  74. Raffoul, Y. N “Positive solutions of three-point nonlinear second order boundary value problem,” International Conference on Industrial and Applied Mathematics, University of New South Wales, Sydney Australia 2003, July 6-12, 2003. (Invited)

  75. Raffoul, Y. N “Boundedness in nonlinear differential equations,” The 985th AMS Meeting, Indiana University, Bloomington, Indiana, April 4-6, 2003. (Invited)

  76. Raffoul, Y. N “Positive solutions of three-point nonlinear discrete second order boundary value problem,” The 22nd Annual Southeastern-Atlantic Regional Conference on Differential Equations at The University of Tennessee, October 11-12, 2002. (Invited)

  77. Raffoul, Y. N “Positive periodic solutions of nonlinear functional difference equations,” The Fourth International Conference on Dynamical Systems and Differential Equations at The University of North Carolina, Wilmington, May 24-17, 2002. (Invited)

  78. Raffoul, Y. N “Stability in linear Volterra integrodifferential equations with nonlinear perturbation,” The 2002 Spring Western Section Meeting, Portland, OR, June 20-22, 2002. (Invited)

  79. Raffoul, Y. N “Uniform asymptotic stability in nonlinear Volterra discrete systems,” The 21st Annual Southeastern-Atlantic Regional Conference on Differential Equations, Wake Forest University, November 2-3, 2001. (Invited)

  80. Raffoul, Y. N “Uniform asymptotic stability in linear Volterra systems with nonlinear perturbation,” The International Conference on Dynamics of Continuous, Discrete And Impulsive Systems at The University of Western Ontario, Canada, July 27-31, 2001. (Invited)

  81. Raffoul, Y. N “Uniform asymptotic stability in linear Volterra difference equations,” The Twentieth Annual Southeastern-Atlantics Regional Conference on Differential Equations at Virginia Tech, October 20-21, 2000. (Invited)

  82. Raffoul, Y. N “Positive periodic solutions for neutral nonlinear differential equations with functional delay,” The Sectional Meeting of the American Mathematical Society, University of Notre Dame, April 8, 2000. (Invited)

  83. Raffoul, Y. N “Asymptotic stability in linear Volterra difference equations,” The Nineteenth Annual Southeastern- Atlantic Regional Conference on Differential Equations, University of Richmond, October 22-23, 1999. (Invited)

  84. Raffoul, Y. N “Asymptotic stability in linear Volterra difference equations,” The Fifteenth Annual Conference on Applied Mathematics, Central Oklahoma University, February 12-13, 1999. (Invited)

  85. Raffoul, Y. N “Periodic solutions of a nonlinear difference equation with finite delay,” The Eighteenth Annual Southeastern-Atlantic Regional Conference on Differential Equations, Auburn University, October 16-17, 1998. (Invited)

  86. Raffoul, Y. N “Periodic solutions for nonlinear Volterra difference equations with infinite delay,” The 1998 Spring Southeastern Sectional Meeting in the Special Session on Boundary Value Problems for Differential Equations, University of Kentucky, March 20-21, 1998. ( Invited)

  87. Raffoul, Y. N “T-periodic solutions and a priori bound”, Midwest -Southeastern Atlantic Joint Regional Conference on Differential Equations, Vanderbilt University, November 7-8, 1997. (Invited)

  88. Raffoul, Y. N “Periodic solutions for nonlinear difference equations,” The Congress on Free Boundary Theory and Applications at Herakleion, Crete, Greece, June 9, 1997. (Invited)

  89. Raffoul, Y. N “Periodic solutions for scalar and vector of nonlinear difference equations,” The Thirteenth Annual Conference on Applied Mathematics, Central Oklahoma University, February 22, 1997. (Invited)

  90. Raffoul, Y. N “Stability and summability of the zero solution of Volterra systems of difference equations,” The American Mathematical Society Southeastern Section Meeting, Louisiana State University, April 21, 1996. (Invited)

  91. Raffoul, Y. N Presented selected results from my Ph.D. Dissertation, University of Dayton, Department of Mathematics Colloquium, March 7, 1996. (Invited)

  92. Raffoul, Y. N “Boundedness and periodicity of a system of Volterra difference equations,” The 24th Midwest Differential Equations Conference, University of Nebraska at Lincoln, October 28, 1995. (Invited)