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  2. List of sums of reciprocals - Wikipedia

    en.wikipedia.org/wiki/List_of_sums_of_reciprocals

    The harmonic mean of a set of positive integers is the number of numbers times the reciprocal of the sum of their reciprocals. The optic equation requires the sum of the reciprocals of two positive integers a and b to equal the reciprocal of a third positive integer c. All solutions are given by a = mn + m 2, b = mn + n 2, c = mn.

  3. Reciprocal rule - Wikipedia

    en.wikipedia.org/wiki/Reciprocal_rule

    In calculus, the reciprocal rule gives the derivative of the reciprocal of a function f in terms of the derivative of f. The reciprocal rule can be used to show that the power rule holds for negative exponents if it has already been established for positive exponents.

  4. Online shopping - Wikipedia

    en.wikipedia.org/wiki/Online_shopping

    An online shop evokes the physical analogy of buying products or services at a regular "brick-and-mortar" retailer or shopping center; the process is called business-to-consumer (B2C) online shopping. When an online store is set up to enable businesses to buy from another businesses, the process is called business-to-business (B2B) online ...

  5. Gift economy - Wikipedia

    en.wikipedia.org/wiki/Gift_economy

    Market or negative reciprocity is the exchange of goods and services where each party intends to profit from the exchange, often at the expense of the other. Gift economies, or generalized reciprocity, occurred within closely knit kin groups, and the more distant the exchange partner, the more balanced or negative the exchange became.

  6. Multiplicative inverse - Wikipedia

    en.wikipedia.org/wiki/Multiplicative_inverse

    For example, the reciprocal of 5 is one fifth (1/5 or 0.2), and the reciprocal of 0.25 is 1 divided by 0.25, or 4. The reciprocal function, the function f(x) that maps x to 1/x, is one of the simplest examples of a function which is its own inverse (an involution). Multiplying by a number is the same as dividing by its reciprocal and vice versa ...

  7. An L.A.-based psychologist said she doesn't return her shopping cart in a video that's generated more than 11 million views as of Monday and a litany of backlash.

  8. Inverse distribution - Wikipedia

    en.wikipedia.org/wiki/Inverse_distribution

    If the original random variable X is uniformly distributed on the interval (a,b), where a>0, then the reciprocal variable Y = 1 / X has the reciprocal distribution which takes values in the range (b −1,a −1), and the probability density function in this range is =, and is zero elsewhere.

  9. Norm of reciprocity - Wikipedia

    en.wikipedia.org/wiki/Norm_of_reciprocity

    "A negative norm of reciprocity represents the means by which individuals act against unfavourable treatments, and functions to keep balance in social systems". [6] In contrast to the positive reciprocity norm, the negative reciprocity norm emphasizes the return of unfavourable treatment as an appropriate response to a misdeed.