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  2. Sobrevivendo no Inferno - Wikipedia

    en.wikipedia.org/wiki/Sobrevivendo_no_Inferno

    Sobrevivendo no Inferno ("Surviving in Hell") is the second studio album of the Brazilian rap group Racionais MC's, released in December 1997.The album reached the mark of 1,500,000 copies sold, despite having been released by an independent record label. [1]

  3. Racionais MC's - Wikipedia

    en.wikipedia.org/wiki/Racionais_MC's

    The presentations continued and increasing impact of Racionais MC's beginning to extrapolate the boundaries of São Paulo. In 1997, a sort of 'DIY' (do it yourself) rap group inaugurates its own label Cosa Nostra Phonographic with the release of the album Sobrevivendo no Inferno (Surviving in Hell), selling over 1.5 million copies independently including the tracks' Diário de um Detento ...

  4. Rational number - Wikipedia

    en.wikipedia.org/wiki/Rational_number

    In mathematics, "rational" is often used as a noun abbreviating "rational number". The adjective rational sometimes means that the coefficients are rational numbers. For example, a rational point is a point with rational coordinates (i.e., a point whose coordinates are rational numbers); a rational matrix is a matrix of rational numbers; a rational polynomial may be a polynomial with rational ...

  5. Cores & Valores - Wikipedia

    en.wikipedia.org/wiki/Cores_&_Valores

    Cores & Valores is the fourth studio album by Brazilian rap group Racionais MC's, launched in 2014 by record companies Cosa Nostra and Boogie Suit.Unlike previous albums, all marked by several long songs, Colors & Values presents several short and direct raps - the longest track is "The Evil and the Good", with exactly five minutes.

  6. Naive set theory - Wikipedia

    en.wikipedia.org/wiki/Naive_set_theory

    A blackboard bold capital Q often represents this set (for quotient, because R is used for the set of real numbers). Algebraic numbers appear as solutions to polynomial equations (with integer coefficients) and may involve radicals (including i = − 1 {\displaystyle i={\sqrt {-1\,}}} ) and certain other irrational numbers .

  7. Basic hypergeometric series - Wikipedia

    en.wikipedia.org/wiki/Basic_hypergeometric_series

    In mathematics, basic hypergeometric series, or q-hypergeometric series, are q-analogue generalizations of generalized hypergeometric series, and are in turn generalized by elliptic hypergeometric series. A series x n is called hypergeometric if the ratio of successive terms x n+1 /x n is a rational function of n.

  8. Quantum number - Wikipedia

    en.wikipedia.org/wiki/Quantum_number

    In the era of the old quantum theory, starting from Max Planck's proposal of quanta in his model of blackbody radiation (1900) and Albert Einstein's adaptation of the concept to explain the photoelectric effect (1905), and until Erwin Schrödinger published his eigenfunction equation in 1926, [1] the concept behind quantum numbers developed based on atomic spectroscopy and theories from ...

  9. Set-theoretic definition of natural numbers - Wikipedia

    en.wikipedia.org/wiki/Set-theoretic_definition...

    In Zermelo–Fraenkel (ZF) set theory, the natural numbers are defined recursively by letting 0 = {} be the empty set and n + 1 (the successor function) = n ∪ {n} for each n.