SYNASC 2019 Preface

This volume contains papers selected from those presented at the 21th International Symposium on Symbolic and Numeric Algorithms for Scientific Computing (SYNASC) held in Timişoara, Romania from 4 to 7 September 2019. SYNASC is a series of annual events that aim to stimulate the interaction between the two scientific communities of symbolic and numeric computing and to present interesting applications of the algorithms developed in the areas both in theory and in practice. The choice of the symposium topic was motivated by the belief of the organizers that the dialogue between the two communities is very necessary for accelerating the progress in making the computer a truly intelligent aid for mathematicians and engineers.