Positive Infinity ∞ Negative Infinity -∞ Imaginary Numbers like i = √-1

Properties of Real Numbers

Uncountable Extend infinitely (but do not include infinity) Any non-zero real number is either negative or positive. Real Numbers can be ordered The sum of two non-negative real numbers is a non-negative real number: x ∈ ℝ, y ∈ ℝ → x + y ∈ ℝ The product of two non-negative real numbers is a non-negative real number: x ∈ ℝ, y ∈ ℝ → xy ∈ ℝ

What 4 concepts are covered in the Real Numbers Calculator?

number

an arithmetical value, expressed by a word, symbol, or figure, representing a particular quantity and used in counting and making calculations and for showing order in a series or for identification. A quantity or amount.

property

an attribute, quality, or characteristic of something