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  2. Imaginary number - Wikipedia

    en.wikipedia.org/wiki/Imaginary_number

    An imaginary number is the product of a real number and the imaginary unit i, [note 1] which is defined by its property i 2 = −1. [1] [2] The square of an imaginary number bi is −b 2. For example, 5i is an imaginary number, and its square is −25. The number zero is considered to be both real and imaginary. [3]

  3. List of imaginary characters in fiction - Wikipedia

    en.wikipedia.org/wiki/List_of_imaginary...

    formerly "imaginary" character in Sesame Street. He is Big Bird's friend and was perceived as imaginary for many years until it was decided that he be revealed to the rest of the show's cast on November 18, 1985 in Season 17, episode 2096 Soren Lorenson, Lola's imaginary friend in the book and television series Charlie and Lola: Spiny Norman

  4. Complex number - Wikipedia

    en.wikipedia.org/wiki/Complex_number

    For example, the first few powers of the imaginary unit i are , =, =, =, =, …. Geometric representation of the 2nd to 6th roots of a complex number z, in polar form re iφ where r = |z | and φ = arg z. If z is real, φ = 0 or π. Principal roots are shown in black.

  5. Imaginary unit - Wikipedia

    en.wikipedia.org/wiki/Imaginary_unit

    The imaginary unit or unit imaginary number (i) is a mathematical constant that is a solution to the quadratic equation x 2 + 1 = 0. Although there is no real number with this property, i can be used to extend the real numbers to what are called complex numbers, using addition and multiplication. A simple example of the use of i in a complex ...

  6. List of fantasy worlds - Wikipedia

    en.wikipedia.org/wiki/List_of_fantasy_worlds

    For example, Middle-earth is only a region of Arda in J. R. R. Tolkien's fictional universe, but it is far better known. ... Building Imaginary Worlds: ...

  7. List of fictional countries set on Earth - Wikipedia

    en.wikipedia.org/wiki/List_of_fictional...

    This is a list of fictional countries from published works of fiction (books, films, television series, games, etc.). Fictional works describe all the countries in the following list as located somewhere on the surface of the Earth as opposed to underground, inside the planet, on another world, or during a different "age" of the planet with a different physical geography.

  8. Object of the mind - Wikipedia

    en.wikipedia.org/wiki/Object_of_the_mind

    For example, acting is a profession which predicates real jobs on fictional premises. Charades is a game people play by guessing imaginary objects from short play-acts. Imaginary personalities and histories are sometimes invented to enhance the verisimilitude of fictional universes, and/or the immersion of role-playing games. In the sense that ...

  9. Paracosm - Wikipedia

    en.wikipedia.org/wiki/Paracosm

    Manuscript by Emily Brontë that contains poems about Gondal, a paracosm. A paracosm is a detailed imaginary world thought generally to originate in childhood. The creator of a paracosm has a complex and deeply felt relationship with this subjective universe, which may incorporate real-world or imaginary characters and conventions.