a rational number and a real number (as well as an algebraic number and a complex number). The number 0 is neither positive nor

negative and is usually displayed as the central number in a number line. It is neither a prime number nor a composite number. It cannot be prime because it has

an infinite number of factors and cannot be composite because it cannot be expressed as a

product of prime numbers (0 must always be one of the factors). Zero is,

however, even (as well as being a multiple

of any other integer, rational, or real number).

In set theory,

0 is the cardinality of the empty set: if one does

not have any apples, then one has 0 apples. In fact, in certain axiomatic

developments of mathematics from set theory, 0 is defined to be the empty set. The

cardinality function applied to the empty set, returns the empty set as a

value, thereby assigning it 0 elements. Also in set theory, 0 is the

lowest ordinal number corresponding to the empty set

viewed as a well-ordered set. In propositional logic, 0 may be used to

denote the truth value false. In abstract

algebra, 0 is commonly used to denote a zero element,

which is a neutral element for addition (if defined

on the structure under consideration) and an absorbing

element for multiplication (if defined). In lattice

theory, 0 may denote the bottom

element of a bounded

lattice. In category

theory, 0 is sometimes used to denote an initial object of a category. In recursion

theory, 0 can be used to denote the Turing degree of

the partial computable functions.

In this study, the

researcher stressed whether the Zero is a number or not. How it was explained

by different studies from the past. It would somehow come to realize the

question from the people who are confused whether the zero is a number or not.