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  2. Goldback - Wikipedia

    en.wikipedia.org/wiki/Goldback

    The Goldback is a fractional gold commercial product marketed as a local currency which has seen limited use in some U.S. states, and sold and marketed by Goldback, Inc. of Utah. The Goldback contains a thin layer of gold within a polymer coating equivalent to 1/1000 of an ounce.

  3. Pentagramma triangularis - Wikipedia

    en.wikipedia.org/wiki/Pentagramma_triangularis

    Pentagramma triangularis, commonly known as the gold fern or the goldback fern, is a species of fern in the family Pteridaceae, native to Western North America, with highest abundance in the state of California. [2] Its common name "goldback" refers to the light yellow color of the fern's protective coating which inhibits moisture loss.

  4. Goldbach's conjecture - Wikipedia

    en.wikipedia.org/wiki/Goldbach's_conjecture

    Goldbach's conjecture is one of the oldest and best-known unsolved problems in number theory and all of mathematics.It states that every even natural number greater than 2 is the sum of two prime numbers.

  5. Goldback fern - Wikipedia

    en.wikipedia.org/wiki/Goldback_fern

    Goldback fern is a common name for several plants and may refer to: Pentagramma triangularis, native to western North America; Pityrogramma This page was last edited ...

  6. Pentagramma - Wikipedia

    en.wikipedia.org/wiki/Pentagramma

    The distribution of P. triangularis (goldback fern) extends from British Columbia through the western United States into Baja California in northwestern Mexico. [3] Pentagramma maxonii occurs in New Mexico, Arizona, Sonora, Baja California Sur, California, and Baja California. All other species are restricted to California and Baja California.

  7. Pityrogramma - Wikipedia

    en.wikipedia.org/wiki/Pityrogramma

    Pityrogramma, the silverback ferns, or goldback ferns, [citation needed] is a fern genus in the subfamily Pteridoideae of the family Pteridaceae. [2] Species.

  8. Christian Goldbach - Wikipedia

    en.wikipedia.org/wiki/Christian_Goldbach

    Born in the Duchy of Prussia's capital Königsberg, part of Brandenburg-Prussia, Goldbach was the son of a pastor. [2] He studied at the Royal Albertus University. [2] [5] After finishing his studies he went on long educational trips from 1710 to 1724 through Europe, visiting other German states, England, the Netherlands, Italy, and France, meeting with many famous mathematicians, such as ...

  9. Waring–Goldbach problem - Wikipedia

    en.wikipedia.org/wiki/Waring–Goldbach_problem

    It asks whether large numbers can be expressed as a sum, with at most a constant number of terms, of like powers of primes. That is, for any given natural number, k, is it true that for sufficiently large integer N there necessarily exist a set of primes, {p 1, p 2, ..., p t}, such that N = p 1 k + p 2 k + ... + p t k, where t is at most some constant value?

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