The set of integers.
An expression
A mathematical phrase containing numbers and operations is called an expression. Expressions can be joined together with an equals sign to form an equation.
Algebraic expressions is a mathematical phrase that contains operations numbers or variables.
"arithmetical expressions" may be what you are seeking.
It is an expression when it does not contain an equality (or inequality) sign
surds:- if this is for the Mail on Sunday GK crossword YES IT IS
A formula is defined as a mathematical expression of a natural law. A formula is a combination of numbers and symbols used to describe how something works.
The natural symbol in mathematical equations represents the relationship between numbers and quantities in a concise and standardized way. It helps to simplify complex calculations and communicate ideas effectively.
WikiAnswers isn't the best at displaying some math, so I've included a link to an image of the proper formatting in the "related links" section, below.
The inclusion of zero in the set of natural numbers depends on the definition being used. In some definitions, particularly in mathematical contexts, the natural numbers start from zero (0, 1, 2, 3, ...), while in others, they begin from one (1, 2, 3, ...). Therefore, zero can be considered an element of the natural numbers in the former definition but not in the latter.
Numbers are mathematical symbols used to represent quantities and perform calculations. They can be classified into various types including whole numbers, natural numbers, rational numbers, irrational numbers, and complex numbers. Numbers can be positive, negative, or zero, and they can be used in various mathematical operations such as addition, subtraction, multiplication, and division.
Natural numbers were not "found" by a single individual; rather, they emerged as a fundamental concept in mathematics over time. The earliest known use of natural numbers dates back to ancient civilizations, such as the Sumerians and Egyptians, who used them for counting and trade. The formalization of natural numbers as a mathematical concept occurred later, with contributions from various cultures, including the Greeks and Indians. Today, natural numbers are defined as the set of positive integers, starting from 1.