The limit of the sequence is L if for any segment with center L, all but a finite number of points are inside that segment. Let’s see some examples:

powerset of set A is set of all subsets of A. Let’s see some examples:

Let’s see how we define a function and see how can we decide that mapping rule is a function.

What is Mapping, Full Mapping and Unique Mapping ? Let’s see the tutorial:

Sometimes you need to prove that 2 sets are equal. Set A is equal to set B if and only if A is subset of B B is subset of A In other words, set A is equal to B…

An emptyset is set without any items. In the following example we see how to prove that a set is the emptyset.

A Venn diagram is diagram that shows possible logical relations between finite collection of different sets. The most common Venn diagram contains 2 sets or 3 sets. Let’s see how can we use Venn diagram to find the relation of…

Complex functions or functions of complex numbers are functions that their argument is complex number. In other words, Complex function is are functions whose domain and codomain are subsets of the set of complex numbers C. While it is easy…