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  2. Contango - Wikipedia

    en.wikipedia.org/wiki/Contango

    Contango is a situation in which the futures price (or forward price) of a commodity is higher than the expected spot price of the contract at maturity. [1] In a contango situation, arbitrageurs or speculators are "willing to pay more [now] for a commodity [to be received] at some point in the future than the actual expected price of the ...

  3. Oil-storage trade - Wikipedia

    en.wikipedia.org/wiki/Oil-storage_trade

    The concept started to be used by oil traders in the market in early 1990. [2] But it was in 2007 through 2009 that the oil storage trade expanded. [6] Many participants—including Wall Street giants, such as Morgan Stanley, Goldman Sachs, and Citicorp—turned sizeable profits simply by sitting on tanks of oil. [5]

  4. Well-formed formula - Wikipedia

    en.wikipedia.org/wiki/Well-formed_formula

    A closed formula, also ground formula or sentence, is a formula in which there are no free occurrences of any variable. If A is a formula of a first-order language in which the variables v 1, …, v n have free occurrences, then A preceded by ∀v 1 ⋯ ∀v n is a universal closure of A.

  5. List of trigonometric identities - Wikipedia

    en.wikipedia.org/wiki/List_of_trigonometric...

    A formula for computing the trigonometric identities for the one-third angle exists, but it requires finding the zeroes of the cubic equation 4x 3 − 3x + d = 0, where is the value of the cosine function at the one-third angle and d is the known value of the cosine function at the full angle.

  6. Ramanujan's sum - Wikipedia

    en.wikipedia.org/wiki/Ramanujan's_sum

    In number theory, Ramanujan's sum, usually denoted c q (n), is a function of two positive integer variables q and n defined by the formula = (,) =,where (a, q) = 1 means that a only takes on values coprime to q.

  7. European Commission - Wikipedia

    en.wikipedia.org/wiki/European_Commission

    Download as PDF; Printable version; ... the member state that does not get a Commissioner would get the post of High Representative – the so-called 26+1 formula. ...

  8. Half-life - Wikipedia

    en.wikipedia.org/wiki/Half-life

    Half-life (symbol t ½) is the time required for a quantity (of substance) to reduce to half of its initial value.The term is commonly used in nuclear physics to describe how quickly unstable atoms undergo radioactive decay or how long stable atoms survive.

  9. Women in 1940s Spain - Wikipedia

    en.wikipedia.org/wiki/Women_in_1940s_Spain

    The 1940s and 1950s were a dark period in Spanish history, where the country was still recovering from the effects of the Spanish Civil War, where the economy was poor and people suffered a huge number of deprivations as a result of the loss of life and the repressive nature of the regime which sought to vanquish any and all remaining Republican support by going after anyone who had been ...