0 is an integer, but not a positive integer. 0 is just an integer. Integer is a set of positive integers, zero and negative integers. All integers form an integer set, which is a number ring. In the integer system, zero and positive integers are collectively called natural numbers. -1, -2, -3, ...,-n are all negative integers. Positive integers, zero integers and negative integers form an integer system. Integers exclude decimals and fractions.
Extended data
0 is an extremely important number, and the concept of 0 has existed in other regions for a long time. In 3000 BC, the Babylonians knew how to use zero to avoid chaos. In ancient Egypt, as early as 2000 BC, some people used special symbols to record zeros in bookkeeping. Maya civilization first invented the special font 0.
0 is an integer from-1 to 1, which is the smallest natural number and also a rational number. 0 is neither positive nor negative, but the dividing point between positive and negative numbers.
Positive integers are also countable infinite sets. In number theory, positive integers, namely 1, 2, 3 ...; But in set theory and computer science, natural numbers usually refer to non-negative integers, that is, the set of positive integers and 0. It can also be said that all natural numbers other than 0 are positive integers. Positive integers can be divided into prime numbers, 1 and composite numbers.