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On upper and lower δ-precontinuous multifunctions |
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| Authors: | Jin Han Park Bu Young Lee Mi Jung Son |
| Institution: | a Division of Mathematical Sciences, Pukyong National University, 599-1 Daeyeon 3-Dong, Nam-Gu, Pusan 608-737, South Korea b Department of Mathematics, Dong-A University, 840 Hadan 2-Dong, Saha-Gu, Pusan 604-714, South Korea |
| Abstract: | In this paper we introduce and study δ-precontinuous multifunctions as a generalization of precontinuous multifunctions due to Popa Problemy Mat. 10 (1988) 9]. Some characterizations and several properties concerning upper (lower) δ-precontinuous multifunctions are obtained. The relationships between upper (lower) δ-precontinuous multifunctions and some known concepts are also discussed. |
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