TY - JOUR AU - Boonpok, Chawalit AU - Viriyapong, Chokchai AU - Thongmoon, Montri PY - 2018 TI - On upper and lower \((\tau_1,\tau_2)\)-precontinuous multifunctions JO - Journal of Mathematics and Computer Science SP - 282--293 VL - 18 IS - 3 AB - This paper deals with the concepts of upper and lower \((\tau_1,\tau_2)\)-precontinuous multifunctions. Some characterizations of upper and lower \((\tau_1,\tau_2)\)-precontinuous multifunctions are investigated. The relationships between upper and lower \((\tau_1,\tau_2)\)-precontinuous multifunctions and the other types of continuity are discussed. SN - ISSN 2008-949X UR - http://dx.doi.org/10.22436/jmcs.018.03.04 DO - 10.22436/jmcs.018.03.04 ID - Boonpok2018 ER -