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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.

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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.

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