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  2. Cross-ratio - Wikipedia

    en.wikipedia.org/wiki/Cross-ratio

    One approach to cross ratio interprets it as a homography that takes three designated points to 0, 1, and ∞. Under restrictions having to do with inverses, it is possible to generate such a mapping with ring operations in the projective line over a ring. The cross ratio of four points is the evaluation of this homography at the fourth point.

  3. Cross elasticity of demand - Wikipedia

    en.wikipedia.org/wiki/Cross_elasticity_of_demand

    In the discrete case, the diversion ratio is naturally interpreted as the fraction of product j demand which treats product i as a second choice, [10] [11] measuring how much of the demand diverting from product j because of a price increase is diverted to product i can be written as the product of the ratio of the cross-elasticity to the own ...

  4. Cross product - Wikipedia

    en.wikipedia.org/wiki/Cross_product

    In mathematics, the cross product or vector product (occasionally directed area product, to emphasize its geometric significance) is a binary operation on two vectors in a three-dimensional oriented Euclidean vector space (named here ), and is denoted by the symbol . Given two linearly independent vectors a and b, the cross product, a × b ...

  5. Contingency table - Wikipedia

    en.wikipedia.org/wiki/Contingency_table

    Contingency table. In statistics, a contingency table (also known as a cross tabulation or crosstab) is a type of table in a matrix format that displays the multivariate frequency distribution of the variables. They are heavily used in survey research, business intelligence, engineering, and scientific research.

  6. Pappus's hexagon theorem - Wikipedia

    en.wikipedia.org/wiki/Pappus's_hexagon_theorem

    The last compound ratio (namely JD : GD & BG : JB) is what is known today as the cross ratio of the collinear points J, G, D, and B in that order; it is denoted today by (J, G; D, B). So we have shown that this is independent of the choice of the particular straight line JD that crosses the three straight lines that concur at A.

  7. Möbius transformation - Wikipedia

    en.wikipedia.org/wiki/Möbius_transformation

    Two points z 1 and z 2 are conjugate with respect to a generalized circle C, if, given a generalized circle D passing through z 1 and z 2 and cutting C in two points a and b, (z 1, z 2; a, b) are in harmonic cross-ratio (i.e. their cross ratio is −1). This property does not depend on the choice of the circle D.

  8. Choked flow - Wikipedia

    en.wikipedia.org/wiki/Choked_flow

    The ratios were obtained using the criterion that choked flow occurs when the ratio of the absolute upstream pressure to the absolute downstream pressure is equal to or greater than ([+] /) / (), where is the specific heat ratio of the gas. The minimum pressure ratio may be understood as the ratio between the upstream pressure and the pressure ...

  9. R (cross section ratio) - Wikipedia

    en.wikipedia.org/wiki/R_(cross_section_ratio)

    R is the ratio of the hadronic cross section to the muon cross section in electron – positron collisions: where the superscript (0) indicates that the cross section has been corrected for initial state radiation. R is an important input in the calculation of the anomalous magnetic dipole moment. [1] Experimental values have been measured for ...

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