Workshop on Numerical and Symbolic Scientific Computing September 20-23, 2021, Sofia, Bulgaria  organized by Institute of Information and Commnication Technologies, Bulgarian Academy of Sciences Institute of Mathematics and Informatics, Bulgarian Academy of Sciences Laboratory of Information Technologies, Joint Institute for Nuclear Research, Dubna, Russia in association with Section "Biomathematics and Scientific Computing" of the Union of Bulgarian Mathematicians and Bulgarian Section of the Society for Industrial and Applied Mathematics For more information please visit: http://parallel.bas.bg/Conferences/NSSC21/