Rupert Fulker asked, updated on February 15th, 2021; Topic:
real numbers

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**π** is an irrational **number**, meaning that it cannot be written as the ratio of two integers. Fractions such as 22/7 and 355/113 are commonly used to approximate **π**, but no common fraction (ratio of whole **numbers**) can be its exact value.

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Then, is the number 0 a real number?

**Real numbers** consist of **zero** (**0**), the positive and negative integers (-3, -1, 2, 4), and all the fractional and decimal values in between (0.4, 3.1415927, 1/2). **Real numbers** are divided into rational and irrational **numbers**.

Further to this, what is the Greek letter for Y?

Greek name of letterUpper Case SymbolPronunciationGamma | Γ | Between Y as in yes and G as in go, but with no hard 'G' sound - more of a soft 'H' followed by the 'Y' sound in yes |

Delta | Δ | Th as in the |

Epsilon | Ε | E as in very |

Zeta | Ζ | Z as in zoo |

No less, where does the phrase Not one iota come from?

An **iota** is something very small. An **iota** is the smallest letter of the Greek alphabet. The expression "**not one iota**" **comes from** the Bible (Matthew 5:18): "For truly, I say to you, until heaven and earth pass away, **not** an **iota**, **not** a dot, will pass from the Law until all is accomplished."

Why do engineers use j for imaginary numbers?

For example, in electrical engineering and control systems engineering, the **imaginary** unit is normally denoted by **j** instead of i, because i is commonly used to denote electric current. For the history of the **imaginary** unit, see Complex **number** § History.

Euler

These **twenty-four letters** (each in uppercase and lowercase forms) are: Α α, Β β, Γ γ, Δ δ, Ε ε, Ζ ζ, Η η, Θ θ, Ι ι, Κ κ, Λ λ, Μ μ, Ν ν, Ξ ξ, Ο ο, Π π, Ρ ρ, Σ σ/ς, Τ τ, Υ υ, Φ φ, Χ χ, Ψ ψ, and Ω ω....**Greek alphabet**

**Greece**.- Cyprus.
- European Union.

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