In mathematics, a real number is a number that can be used to measure a continuous one-dimensional quantity such as a distance, duration or temperature...

In mathematics, the extended real number system is obtained from the real number system R {\displaystyle \mathbb {R} } by adding two infinity elements:...

Informally, a definable real number is a real number that can be uniquely specified by its description. The description may be expressed as a construction...

π: Every point of the number line corresponds to a unique real number, and every real number to a unique point. Using a number line, numerical concepts...

numbers are an extension of the real numbers to include certain classes of infinite and infinitesimal numbers. A hyperreal number x {\displaystyle x} is said...

numbers, effective numbers or the computable reals or recursive reals. The concept of a computable real number was introduced by Émile Borel in 1912, using...

bi, the real number a is called the real part and b is called the imaginary part. If the real part of a complex number is 0, then the number is called...

In mathematics, a complex number is an element of a number system that extends the real numbers with a specific element denoted i, called the imaginary...

In number theory, a number field F is called totally real if for each embedding of F into the complex numbers the image lies inside the real numbers....

In mathematics, a transcendental number is a real or complex number that is not algebraic – that is, not the root of a non-zero polynomial with integer...