Effective Time Fuzzy Soft Set

The most useful extension for fuzzy soft groups is the effective fuzzy soft group, which explains the effect of external efficacy on soft groups and is called effective fuzzy soft set (EFSS). This extension is the first extension of fuzzy soft set which considers the external effect on fuzzy soft set. Another extension of the fuzzy soft set was the time fuzzy soft set (TFSS) introduced by Ayman A. Hazaymeh in his Ph.D. thesis. In this paper we define the concept of effective time fuzzy soft set with respect time (ETFSS), which is the combination between effective fuzzy soft set and time fuzzy soft set. Also, we introduce basic operations and some properties of (ETFSS) with suitable examples.