Real Numbers

In maths¹, a real number is a number that can be used along a number-line. They are called real numbers to differentiate them from imaginary numbers. The set of all reals is denoted with $\mathbb{R}$.

Backlinks

• A Programmers Introduction to Mathematics
  • real numbers
• Topic: Maths
  • real numbers
• Blackboard Bold
  • $\\mathbb{R}$ denotes the set of real numbers
• Language: Function over a set
  • In maths, for a given function, it can be said to operate 'over' a set in the case that its domain and codomain are in the same set. For example the function $f : \\mathbb{R} \\rightarrow \\mathbb{R}$ could be said to be a function over reals.
• Tuples
  • $\\mathbb{R}^3$ denotes a set of 3-tuples of real numbers, as an example. I.e $(4, 1023, -3) \\in \\mathbb{R}^3$ (inclusion in a set)

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1. from a Programmers intro to Maths ↩