its not well defined because not all the students/people like the teachers,so it is not well defined
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The set of "good teacher" is not well-defined because the criteria for what makes a teacher "good" can vary significantly based on individual perspectives, cultural norms, and educational philosophies. Factors such as student outcomes, teaching methods, communication skills, subject knowledge, and personal characteristics all play a role in defining a good teacher. Therefore, what constitutes a good teacher may differ from person to person, making it a subjective and complex concept.
Elements that have to be defined by personal judgement. Such as the set ofgreat songs is not well-defined. But the set of the English alphabet is well-defined.
The description of a well defined set clealy states what is in the set. For example, "deciduous trees" is a set that only includes trees that are deciduous. No conifers or non-deciduous trees are in the set. "Tall trees" is not well defined because the members of the set depends on what "tall" means to different people. Well-defined sets can be illustrated by using pictures of what would be inside and outside a circle to show which would and would not be in the set.
no
A collected of well defined objects is called a set.
It is the set on which the relation is defined to the set which is known as the range.