(τ1, τ2)δ-semicontinuous multifunctions

doi:10.1016/j.heliyon.2020.e05367

2020-11-01

Chawalit Boonpok *

DOI：10.1016/j.heliyon.2020.e05367

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摘要

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The purpose of the present article is to introduce the concepts of upper and lower (tau(1), tau(2))delta-semicontinuous multifunctions. Some characterizations of upper and lower (tau(1), tau(2))delta-semicontinuous multifunctions are investigated. The relationships between upper and lower (tau(1), tau(2))delta-semicontinuous multifunctions and the other types of continuity for multifunctions are established.

Keyword:

Bitopological space

Semi-continuity

Almost continuity

Weak continuity

Multifunction