About ISMCS2019 2019 4th International Symposium on Mathematics and Computer Science (ISMCS2019) (http://www.ismcs.net/2019/en/home) is a platform for academic communications between specialists and scholars in the fields related to mathematics and computer science. ISMCS2019 will be held in Nanjing, China during Aug. 12-14, 2019. Nanjing is the capital of Jiangsu province and the second largest city in eastern China (after Shanghai). Publication 2019 4th International Symposium on Mathematics and Computer Science (ISMCS2019) accepts original and unpublished papers. Both Full paper and Abstract are welcomed. Full papers accepted by the conference will be published online in the following journals of Science Publishing Group (http://www.sciencepublishinggroup.com). The journals have been indexed and abstracted by WorldCat, CrossRef, Electronic Journals Library, CNKI, Zeitschriftendatenbank, EZB, ResearchBib, Polish Scholarly Bibliography, Wissenschaftszentrum Berlin, etc. Applied and Computational Mathematics (ACM) http://www.sciencepublishinggroup.com/j/acm ISSN Print: 2328-5605 ISSN Online: 2328-5613 Journal of Electrical and Electronic Engineering (JEEE) http://www.sciencepublishinggroup.com/j/jeee ISSN Print: 2329-1613 ISSN Online: 2329-1605 Science Discovery (SD) http://www.sciencepublishinggroup.com/j/sd ISSN Print: 2331-0642 ISSN Online: 2331-0650