Special Issues Special issue of Journal of Mathematical Sciences, Vol. 20, N. 1, (2004): 869-994, Aveiro Seminar on Control, Optimization and Graph Theory. This special issue, includes the following selection of papers from 2002-2004 CEOC seminar series: A Stochastic Approximation Algorithm with Step-Size Adaptation - A. Plakhov, P. Cruz Abnormals and Cut Loci - S. Jacquet An Application of Control-Theoretic Methods to Digital Arithmetic Algorithms - E. Rocha, A. Sarychev, A. Pereira, R. Rodrigues Arcwise Connectedness of Sets of Solutions to Differential Inclusions - V. Staicu Carathéodory Equivalence, Noether Theorems, and Tonelli Full-Regularity in the Calculus of Variations and Optimal Control - D. F. M. Torres Distribution-Like Hamiltonian Flows and Generalized Optimal Controls - M. Guerra Equitable Bipartitions of Graphs and Related Results - D. Cardoso, P. Rama Euclidean Jordan Algebras with Strongly Regular Graphs - D. Cardoso, L. Vieira Minimal Convergence Conditions for Multiplicative Normalization Division - A. Pereira, R. Rodrigues Nonstandard Calculus of Variations - V. Neves On the Constructive Solution of Convex Programming Problems in Separable Form - T. Tchemisova Optimal Paths in Probabilistic Networks - D. Rasteiro, A. Batel Relation Between the Kendall and Spearman Coefficients and Concordance Graphs - A. Plakhov Singular Points and Singular Values of Mappings of Hilbert Manifolds - S. Jacquet and A. Sarychev Special issue of Journal of Mathematical Sciences, (to appear in 2009): Aveiro Seminar on Control, Optimization and Graph Theory (second series). This special issue, will include the following approved papers from 2005-2007 CEOC seminar series: Mountain pass theorems without Palais-Smale conditions - Natália Martins Combined dynamic Gr"{u}ss inequalities on time scales - M R Sidi-Ammim, D.F.M. Torres Necessary and sufficient conditions for local Pareto optimality on time scales - A. Malinowska, D.F.M. Torres On the two-dimensional rotational body of maximal Newtonian resistance – P. Gouveia, A. Plakhov, D.F.M. Torres A reference point technique to compute non-dominated solutions in MOLFP – J. P. Costa, M. J. Alves A note on Grobner bases – P. Carvalho Second order conditions on the overflow traffic from the Erlang-B system - a unified analysis - D. M. Cardoso, J. Craveirinha, J. Sá-Esteves An interactive method to tackle uncertainty in interval multiple objective linear programming - C. Oliveira, C. H. Antunes The number of faces of the tridiagonal Birkhoff polytope - L. Costa, C. M. Fonseca, E. A. Martins Study of a special nonlinear problem arising in convex semi-infinite programming - O. Kostyukova, T. Tchemisova, S. Yermalinskaya A strong form of almost differentiability – R. Almeida, V. Neves Embracing Voronoi diagram and closest embracing number – M. Abellanas, A. L. Bajuelos, G. Hernández, I. Matos. B. Palop The linking set problem: a polynomial special case of the multiple-choice knapsack problem – A. Agra, C. Requejo Greedy heuristic for the diameter-constrained minimum spanning tree problem – C. Requejo, E. Santos A heuristic for the stability number of a graph based on convex quadratic programming and tabu search – L. Cavique, C. J. Luz Solving huge size instances of the optimal diversity management problem – A. Agra, D. M. Cardoso, J. O. Cerdeira, M. Miranda, E. Rocha Branches in scale-free trees, M. Dondajewski, J. Szymanski On stability and stabilization of elastic systems by fast-oscillating time-variant feedback - M I. Caiado, A. Sarychev