On ST-essential (complement) submodules Authors Zainab Rzaij Mohammad Department of Mathematics, College of Science, University of Baghdad, Baghdad, Iraq Sahira Mahmood Yassin Department of Mathematics, College of Science, University of Baghdad, Baghdad, Iraq DOI: https://doi.org/10.24996/ijs.2020.61.4.17 Keywords: S-Essential, T-Essential, ST-Essential, T-Complement, ST Complement Abstract Connection failed: User ijs already has more than 'max_user_connections' active connections